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Really? I see locked stores/restaurants all the time with staff inside.
That's fine for doors that unlock when you push the bumper-style handle from the inside. Some older doors without this must be unlocked to open from inside.
This is for deadbolt style locks. They have to turn a little knob (or key) to unlock it.
Let's hope they're never on fire, then.
There's also differences between states on fire regs
And fire-safe doors that can be opened from the inside only.
Regulations vary from place to place...
In some places it may be that having at least one nearby exit unlocked to people inside is sufficient so a place with a deadbolt locked front door and a nearby push to open style backdoor could still be compliant.
If they are older doors that cant be pushed open (riotbars and or firerelease style locks) then this is the law at least in most of the US. New commercial properties MUST have these style doors, but old ones can be grandfathered in with that clause.