I think they would keep in the Stormtrooper conking his head on the door.
In Ep II, Jango did it getting into Slave 1, and the commentarry by Lucas and staff said that it's going to be an in-joke: Jango couldn't see well through the helmet and kept hitting his head on doors, and the Stormtroopers, being clones of Jango, had the same problem.