Which of these activities count as hours worked that must be paid at least the minimum wage?

1. limo driver driving his own car from home to work
2. the hotel's electrician siting in his office watching TV and waiting for service call, but there are no calls.
3. mandatory orientation before starting work
4. changing into a required bartender's uniform in the locker room
5. a one half hour lunch break when the worker does not have to work at all