Close Door Buttons
In most elevators, at least in any built or installed since the early nineties, the door-close button doesn’t work. It is there mainly to make you think it works.
And (unrelated, but from the same article):
The [elevator] escape hatch is always locked. By law, it’s bolted shut, from the outside. It’s there so that emergency personnel can get in, not so passengers can get out.
From a fascinating & terrifying story about elevators, and getting stuck in them, by Nick Paumgarten in the New Yorker.
Once you’re done with the story, check the video.