Depends on wether I'm being punished or am punishing someone. If I'm punishing someone I'd like to have something to do with the people that step thru doors of a bus or train or metro during rush hour, and then immediately stop, blocking the entrance, despite there being a large crowd behind them that also needs to enter.
Maybe I make them drop stuff right before the train departs? Their ticket, and then I am a ticket controller maybe. Could be fun.

If I'm being punished my job would probably be to endlessly take the metro during rush hour.