Let's be honest, shall we? Every single one of us has pushed the 'close door' button in the elevator whether someone was coming or not because we just want to keep moving. Hey, I've done it.

elevators, must stay open for even longer — 20 seconds — or at least be available to reopen (using a call button, for example) while stationary on one floor. After those time limits ...

elevators, must stay open for even longer — 20 seconds — or at least be available to reopen (using a call button, for example) while stationary on one floor. After those time limits, the “door close” ...