You will get frozen, but you have to wait to set it off till the lever is back in it's original position, and then you can walk. Most doors will stay open, only a small portion of them will close or not give access with the use of invisible walls.
Bleeping hell, I wish i'd seen ur post 3 days ago. Would've saved me about 2 hrs worth of swearing at the stupid camera angles... not to mention the tendency of the AI to decide to deviate a bit from the wall u intended to wall run up to... causing u to drop -_-'