system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:  Why do businesses with double doors usually only unlock one?
gpt
For the same reason a lot of convenience stores and gas stations modify their doors to be harder to push open (they seem heavier). It makes it harder for people to run out and take off in a snatch-and-grab or other criminal situation.

You'll especially notice this in pawn shops that have two sets of doors and a little hallway in between -- they'll usually unlock only the doors diagonal from one another so that anyone who runs out has to go through one door and cut across to the one diagonal from it. This gives security more time to respond and apprehend.