Jerk off. Take a nap. Cry. Bang out 50 pushups. repeat until rescued.
Elevator have call phones or buttons.
sing, dance, play with myself
be bored, and maybe have sex with a random woman
if there is absolutely no way to entertain myself, just wait...
Push that little Pause button and take an uninterrupted nap.
After that, I'd push the little red emergency button.
Climb up the shaft to the next floor opening
No-one there? Go to sleep.
Someone there? Read something.
depend on who else traped in there with me and how crowded it is.,