Imagine, you're playing Mass Effect, you get in a lift and press the button. Nothing happens, you can't move, and the lift won't move either. This has happened to me too many times, for some odd reason only on Noveria. This helps.
1. Go to My Docs\BioWare\Mass Effect\Config and open BIOInput.ini in notepad (you might want to make a copy first as a backup).
2. find the line [Engine.Console] add the line ConsoleKey=Tilde under it. Save and close the ini.
Now everytime you get stuck in the lifts press the tilde key to bring up the console and do the following:
1. in the console type in ghost and press enter. Exit the console (escape). You still won't be able to move, but thats not important.
2. Bring up the console again, type in walk and press enter. Close the console (escape).
After doing this turn towards the lift button and press it again. The lift should work as intended.
As an alternative you might want to get into the habit of quicksaving before every lift.