I surely wouldn't get off an elevator for some random person. They can wait just the same as everyone else. After all, isn't this was the feminists want?
15ft is more than enough. I've jumped from about 50ft into about 8ft of water. Here is a video of me jumping from that bridge. The top is about 50ft.
https://www.youtube.com/watch?v=7cmtBmRkPyI