Stalled

It's Christmas Eve. A down-on-his-luck janitor is cleaning cubicles in an office block. Unfortunately for this forlorn floor-sweeper, he becomes trapped in the washroom the very second a zombie outbreak occurs. Will he be able to hit the emergency alarm with severed fingers and a catapult bra? Has he met his Waterloo? Will he just go potty? Or will he simply remain... Stalled?