Okay. Let's remove that button.
Now go to another floor, and then back to the one you were on before. Oh, wait, you can't, because it's gone.
Idiot.

Here's a trick. Go to the second highest floor the elevator will go to, then before you get out, push the button for the highest floor. Once you get out, use a crowbar to pry the door open after the cabin goes up. Now jump into the shaft and never be seen again.