Trapped Child

She was four years old. But how will she react when she trapped in elevator?

It was a highrise building. I was on my way to car parked in the underground parking. When I came out of elevator, a mother was in tears and she was out words. My child... My childd. She asked me, "get my child"

First i didn't understand. After a minute or two, she explained that her her four year dauter got inside the elevator and before mother get in elevator went up.

how can I help her? What would you do if you were in that position?