The door close buttons are for when the elevator is in fire service mode. In that mode, the lift only does what the operator (a fireman) tells it to do, for goo

The door close buttons are for when the elevator is in fire service mode. In that mode, the lift only does what the operator (a fireman) tells it to do, for good reason. If they take the lift to the fourth floor, say where a fire is, the doors will only open when the "door open" button is held. Same for the opposite with the "door close" button.