I'm sure it's old news by now, but I'm just getting around to reading this article on elevators in the New Yorker, and this, in particular, stood out to me:
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. (It does work if, say, a fireman needs to take control. But you need a key, and a fire, to do that.) Once you know this, it can be illuminating to watch people compulsively press the door-close button. That the door eventually closes reinforces their belief in the button’s power. It’s a little like prayer.
It's true: even though I know that the close button doesn't work, I still use it.