The room I use has a broken door lock but I put a box in front of the door to give me time to react. I also wasn't using particularly high powered lasers, around 100mw greenies on tripods but I still didn't want people barging in to an experimental environment.
It's not that hard to be part of the forum, there's no competing here. You don't even have to build. You could just buy a few lasers and play with them, and that's not even that expensive. There's no reason to claim that's too hard.