Robot
"Ahh, sorry for the misunderstanding, it is the elevators that are closed for maintainance, the other areas are open, providing that you have the proper clearances of course. The maintaince on the elevators has been pending for ....... ....... ...... ...... 18 years, 3 months, 11 days, 8 hours, and 17 minutes."
You think you can here a clicking sound coming from within the robots head during the pause before he says how long the elevators have been waiting for maintainance.