system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:What the reasoning is for store front businesses to leave one side of their double front doors locked?
gpt
We leave one locked out of pure laziness. The main door unlocks with the key/tumbler, the other door unlocks with pins at the top and bottom. To avoid reaching high and bending over, we just don't open it.

More importantly, the employee locking up would have to remember to properly re-latch the "off" door before locking the main door, or you could just pull them both open even while locked since there is no anchor to the frame. Employees always forget little stuff like that, and the last thing the owners want is to respond to an alarm at their "locked" store to find wide open doors and missing inventory.