ALL and I repeat ALL of the elevators where I live and travel have emergency phones, but no video. If that were me I would have.
1. Use the emergency phone if there was one.
2. Checked for cell service, tried 911 if that service was available.
3. Opened the inner doors and looked to see if I was within shouting distance to the next floor, I know when I stand waiting for an elevator I can hear people talking on the elevator as it comes to my floor.
4. Tried the roof hatch,if there was one.
5. If all that failed, then I would sit down and wait.
6. Use shoe to bang on walls, to try to draw attention.
Stokie & UTA mentioned trying to chip through the block wall, that would be an option.
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Shadow out !!!
Prepare Or Not To Prepare That Is The Question. The Answer, You Better !!!