system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it that you often have to "use the other door" when entering restaurants? Sometimes the half of the door is even bolted.
gpt
A lot of double doors are nested, one has to be closed before the other.  Customers aren't going know this, and will often close them wrong,  resu;ting in the door getting banged up and not shutting all the way.  Leaving the door that should be shut first closed and locked prevents this.