[Updated thread] Need help

[Romulator]

Can your gate/door rotate on the appropriate axis (try comparing it to the doors in Amnesia)? If so, then you just need to use AddPropForce or AddPropImpulse on completion of your puzzle or button pressing callback(s).

If your door cannot rotate, put it somewhere out of the player's view, then place an "open" gate or door in the Level Editor (a door which is open at 90 degrees) in the appropriate place. Once done, make the new door visible, and make the old one invisible on your puzzle completion or button press in the appropriate callback(s).