If The shop's back door only latches if someone slams it.
Then Adjust the closer and realign the strike.
Usually the closer is out of adjustment or the strike has drifted; both are set, not replaced.

Locks for shops, offices and buildings: rekeying at turnover, commercial-grade hardware, exit devices, master key systems and access control.
A commercial key plan should survive the person who set it up. We leave a written schedule of which key opens which door and who holds what, so a new manager inherits a system rather than a mystery.
Commercial RekeyingThe manager's key ring went missing somewhere between the bank and the car, and the master on it opened every door in the…
Master Key System DesignA self-storage operator wants the office, the tenant gate and the equipment shed on three different levels of access for staff…
Access Control InstallationSomething went missing from the storeroom over a weekend, and when you ask who was in the building, the honest answer is anyone…
Panic & Exit HardwareAfter the fit-out, the gym floor now holds more people than the old office space ever did, and the exit door at the back still…
Commercial-Grade Lock ReplacementAt closing time the hookbolt on the storefront door catches the keeper only on the second or third try, and one employee has…Tap a situation. The answer opens here.
If The shop's back door only latches if someone slams it.
Then Adjust the closer and realign the strike.
Usually the closer is out of adjustment or the strike has drifted; both are set, not replaced.
If The fire exit alarm sounds every time staff use that door.
Then Service the exit device and rethink the routine.
Exit alarms are meant to sound; if staff need that door daily, an arrangement that still lets everyone leave freely is found.
If The storefront lock is worn and the key barely catches.
Then Replace the cylinder with a commercial-grade one.
Storefront cylinders take a beating; a heavier grade is built for that traffic.
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