A property manager calls: “The lock on the back door doesn’t work.” We get there, test the lock, and the lock is fine. The door has sagged an inch and a half on the hinge side. The latch bolt doesn’t reach the strike. The lock isn’t broken, the door is.
This is the most common service call we get at Pro Locksmith LLC. Property managers, restaurant owners, and building supers see a door that won’t latch and assume the lock failed. Nine times out of ten, the lock is the last thing that’s wrong. The problem is the door, the frame, or the hinges, and replacing the lock won’t fix any of it.
This article covers the four most common commercial door problems we see in Fort Lauderdale, why they happen, and what it actually takes to fix them.
Hinge Sag: The Problem Hiding in Plain Sight
Commercial doors are heavy. A standard 36-inch hollow metal door typically weighs 70 to 100 pounds. A solid wood door in a restaurant entrance commonly weighs 120 pounds or more. That weight sits on three hinges, typically 4-1/2 inch or 5 inch heavy-duty commercial ball-bearing hinges, and over years of use, those hinges wear out.
Here’s what happens:
The hinge knuckles wear. The ball bearings inside the hinge seize. The screws that hold the hinge to the frame work loose. The door drops, slowly at first, then faster as the gap between the door and frame narrows. The latch bolt, which was designed to align perfectly with the strike, now sits a quarter inch, a half inch, or more below the strike opening. The door won’t latch.
The fix depends on how bad the sag is:
Worn hinges. Replace the hinges. On commercial doors, use ball-bearing hinges rated for the door’s weight. Continuous geared hinges (Pemko, Hager, McKinney) are the upgrade, they distribute the door’s weight along the full height of the frame instead of three points, which eliminates the sag problem permanently.
Stripped screw holes. The hinge screws have pulled out of the frame. Fill the holes with metal repair inserts or weld the holes shut and redrill. Don’t use longer screws in a hollow metal frame, they’ll just strip again.
Frame damage. If the hinge pocket itself is cracked or deformed, the frame needs welding. This is more common in high-traffic doors that have been slammed for years. Door closer problems can accelerate hinge wear, a closer that slams the door puts stress on the hinges with every cycle. See our article on commercial door closer repair for diagnosing closer failures.
Frame Shift: When the Building Moves
South Florida buildings settle. Foundations shift in the limestone and sand that underlies most of Broward County. Commercial frames, especially in older buildings in Fort Lauderdale, Hollywood, and Dania Beach, can move out of plumb over time. When the frame shifts, the door shifts with it, and the alignment between the door, the frame, and the lock hardware falls apart.
Signs of frame shift:
- The gap between the door and frame is wider at the top than the bottom (or vice versa)
- The door sticks at the top corner but swings free at the bottom
- The latch bolt scrapes the strike plate instead of entering it cleanly
- The door closes but bounces back open, the latch isn’t seating
Frame shift is harder to fix than hinge sag. If the frame has moved slightly, you can sometimes re-align the strike plate or adjust the hinge positions to compensate. If the frame has shifted significantly, the frame itself needs to be reset or replaced, that’s a welding and framing job, not a locksmith job. But we can tell you whether that’s what’s happening before you pay for it.
Threshold Wear: The Gap at the Bottom
Aluminum thresholds in commercial doorways take a beating. Foot traffic, delivery carts, hand trucks, and cleaning equipment wear them down over time. The threshold sinks, the gap between the door bottom and the threshold widens, and suddenly you have:
- Air conditioning escaping (which shows up on the utility bill)
- Humidity and rain entering (which warps wood doors and rusts metal ones)
- Pests entering
- The door sweep or weatherstripping no longer making contact
In South Florida, a gap at the bottom of a commercial door isn’t just an energy issue. Hurricane season means wind-driven rain. A worn threshold with a gap lets water into the building during storms, which can damage flooring, drywall, and inventory.
The fix: replace the threshold with a commercial-grade aluminum threshold (typically 36-inch or 48-inch, depending on door width), install a new door sweep or automatic door bottom, and verify the weatherstripping along the frame is intact. On fire-rated doors, the threshold and weatherstripping must maintain the fire rating, you can’t substitute residential-grade materials. Standard commercial threshold manufacturers include Pemko, Hager, and National Guard Products.
Why the Lock Is Usually Not the Problem
When a door won’t latch, the lock is doing exactly what it was designed to do. The latch bolt extends when the door closes, but it’s aimed at the wrong spot because the door has moved. The lock hasn’t failed, the door has failed around it.
Here’s how to tell before you call:
- Close the door slowly and watch the latch bolt. Does it hit the strike plate dead center? If it’s hitting above or below the strike, the door has sagged or shifted.
- Check the hinge gap. Open the door and look at the gap between the door and frame at the hinge side. Is it even top to bottom? If it’s tight at the top and wide at the bottom, the top hinge has dropped.
- Lift the door. If you lift the door by the handle and the latch clicks into the strike, the hinges are worn or the screws are loose. The lock is fine.
- Check the gap around the door. A properly aligned door has consistent gaps on all sides, roughly the thickness of a nickel. If the gaps vary, the door is out of alignment.
If any of these tests point to the door or frame rather than the lock, replacing the lock won’t help. You need a commercial door technician, not a new lock cylinder.
South Florida’s Effect on Commercial Doors
Three factors accelerate commercial door problems in Fort Lauderdale and the surrounding area:
Humidity. Wood doors absorb moisture and swell. In South Florida’s 80-90% humidity, a wood door that fits perfectly in January may stick in August. Swelling warps the door, changes the alignment, and puts stress on the hinges. When the humidity drops, the door shrinks back, but the warping may be permanent.
Salt air. Coastal Broward County’s salt-laden air corrodes metal hinges, frames, and lock hardware faster than inland environments. Ball-bearing hinges seize. Aluminum frames pit. Steel screws rust and snap off when you try to remove them. This is why we use stainless steel hardware on exterior doors within five miles of the coast.
Thermal cycling. Metal doors and frames expand in the heat and contract at night. Over years of daily expansion and contraction, screws loosen, hinges shift, and frames move out of alignment. The effect is worse on dark-colored doors that absorb more solar heat.
Don’t Replace the Lock Before You Check the Door
If your commercial door won’t latch, sticks, drags, or won’t stay closed, don’t order a new lock. Call us at (954) 406-8266. We’ll identify whether the problem is the lock, the hinges, the frame, or the threshold, and fix the actual cause, not the symptom. Licensed, insured, employees not subcontractors. COI provided for commercial work.
Pro Locksmith LLC, commercial door hardware and access control in Fort Lauderdale, Hollywood, Pembroke Pines, and Plantation.
Glass Storefront Doors Have Their Own Failure Points
The hinge sag described above applies mostly to hollow metal and wood doors hung on butt hinges. Aluminum and glass storefront doors in Fort Lauderdale shopping plazas and office lobbies usually hang differently. Many swing on pivots, a pin at the top of the door and a pivot at the bottom, rather than on hinges along the side. Others hang on continuous hinges. Each arrangement fails in its own way.
Offset pivots carry the full weight of the door on the bottom pivot. Over time the bearing wears, the door drops at the lock side, and it begins to scrape the threshold or the bottom rail catches on the floor. Center hung doors often sit on a floor closer, a closer mechanism set into a box in the concrete beneath the door. Floor closers can leak fluid, lose their ability to control the swing, or rust when water collects in the box, which is common in entryways that take rain.
A glass door that drags, drops, or swings too freely is often mistaken for a lock problem because the lock stops lining up. Replacing the pivot, servicing or replacing the floor closer, or re-leveling the door usually brings the lock back into alignment without touching it.
Double Doors: Astragals, Flush Bolts and Coordinators
Pairs of doors add parts that single doors do not have, and each is a common source of trouble.
- Flush bolts: the bolts on the edge of the inactive leaf that drop into the floor and rise into the frame head. When the floor hole fills with debris, or the bolt is bent, the inactive leaf does not stay put and the pair will not lock properly.
- Astragals: the strip that covers the gap where the two doors meet. A damaged or loose astragal can stop the active leaf from closing fully, or leave a gap that makes the latch easier to reach.
- Coordinators: a device at the head of the frame that makes sure the inactive leaf closes before the active one. If it is missing or out of adjustment, the doors close in the wrong order and the active leaf hangs up on the astragal.
On fire rated pairs, these parts are part of the rating, so a repair uses components listed for that purpose. On a pair that has not closed correctly in years, fixing the coordinator is often the whole job.
Rust at the Bottom of Hollow Metal Doors
Steel doors in South Florida rot from the bottom up. Water from rain, mopping and pressure washing collects along the bottom edge, and the steel skin rusts through where you cannot see it. By the time rust shows on the face, the bottom channel inside may already be gone. A door in this condition flexes when pushed, can lose the screws that hold its hardware, and becomes easier to pry.
Depending on how far it has gone, the fix may be cutting out and replacing the bottom channel, adding a door bottom that sheds water, or replacing the door. Doors near the coast and doors that face east into driving rain tend to need attention first. When we replace a door, we recommend sealing the top and bottom edges so water cannot enter the core.
Security Weak Points That Are Not the Lock
A door can have an excellent lock and still be easy to defeat because of what surrounds it. These are the weak points we see most often on rear and service doors:
- Exposed hinge pins on outswinging doors, which can be tapped out from outside. Security hinges with non-removable pins, or security studs that hold the door in the frame even without the pin, solve this.
- A gap at the latch edge wide enough to insert a pry tool. A latch guard, a steel plate that covers the gap, makes it much harder to reach the latch.
- A thin or damaged strike that bends when the door is forced. Heavier strikes, and securing them with longer screws into solid framing, add resistance.
- Glass near the lock that can be broken to reach an inside lever or thumbturn. Changing the hardware function or adding protection to the glass reduces that risk.
These upgrades are inexpensive compared with the cost of a break-in, and they are straightforward to add during a repair visit.
Fire Rated Doors Need Rated Repairs
Many commercial doors are fire rated, especially those leading to stairwells, corridors and utility rooms. You can usually find the rating on a label on the hinge edge of the door and on the frame. A fire door only works as intended when it closes and latches on its own. A door that is propped open, will not latch, or has holes left from removed hardware may not perform in a fire.
The national standard for fire doors, NFPA 80, calls for these assemblies to be inspected and tested periodically, and local fire inspectors check them during their visits. Repairs to fire doors should use hardware listed for fire door use, and holes left from old hardware should be filled with approved methods rather than covered over. If a fire door on your property will not close and latch, it is a repair to schedule soon rather than a cosmetic issue.
Door Edges, Kick Plates and Everyday Wear
In restaurants, medical offices, warehouses and retail backrooms, doors get hit by carts, dollies and equipment all day. Dents and bent edges eventually interfere with the latch, and a door that has been struck at the bottom often springs slightly out of plane. Protective plates on the push side and edge guards on the latch side absorb much of that abuse. They are easy to add and they extend the life of the door and its hardware.
Temporary Measures After a Door Is Damaged
Sometimes a door is damaged after hours, by a delivery truck, a forced entry attempt, or storm debris, and a full repair has to wait for parts. The priority is to leave the building secure without creating a hazard. A damaged door can often be secured temporarily by reinforcing the strike, installing a surface bolt on the inside, or pinning an inactive leaf. On exit doors, any temporary measure must still let people get out from inside. We avoid chains and padlocks on egress doors for that reason, and we will tell you plainly if a door cannot be both secure and code compliant until the permanent repair is done.
Once the building is secure, photograph the damage before repairs start. Property managers and business owners often need those photos for landlords, insurance claims, or police reports, and they are impossible to take after the door has been fixed.
What to Note Before You Call for Service
A few details from you make the visit faster and help the technician bring the right parts:
- What kind of door it is: glass storefront, steel, or wood, and whether it is single or a pair.
- What it does wrong: drags, will not latch, swings too hard, will not close, or leaks at the bottom.
- Whether the problem is constant or comes and goes with heat, rain, or time of day.
- Whether there is a label on the edge indicating a fire rating.
- Photos of the hinges or pivots, the latch and strike, and the bottom of the door.
Scheduled Maintenance Keeps Small Problems Small
Most of the failures on this page develop slowly. A property that has its doors checked on a regular schedule catches a loose hinge screw before the door sags, a dry pivot before it wears through, and a closer leak before the door starts slamming. A basic maintenance visit tightens fasteners, lubricates hinges and pivots, checks closer speed and latching, and notes anything that needs a follow up repair. For busy retail and restaurant doors, twice a year is a reasonable rhythm.
Repair or Replace?
Most commercial door problems are repairable, and we will say so when they are. Replacement makes sense when a steel door has rusted through, a frame is badly deformed, glass door rails are cracked, or the cost of repairs over the next few years will clearly exceed the cost of a new opening. When we recommend replacement, we explain why and what the new door and hardware should include so the same failure does not repeat.
Pro Locksmith repairs commercial doors and hardware throughout Broward County, north through Boca Raton and Delray Beach and on to West Palm Beach for commercial properties, and south through Aventura, North Miami, Coral Gables and Coconut Grove.