what I mean with the the elevator puzzle was actually the last part of the lab, the part where you find the room with a wardrobe in which you find the elevator to escape the lab, I find it difficult to activate the elevator, but maybe that was just me.
Oh okay, but come on.. you finally made it.
I think it's a normal part of an adventure puzzle game that you have to try out things, pressing some buttons and then look what happens. In that section you would like to close the elevator doors, right? and hell yeah, there's a button for it. :-)