First things first, if you're worried about your stuff, get a lock to your own door. :3 If a thief comes into the house, they'll only be able to loot everybody else's stuff (and it sounds like it might teach them a lesson).

As for solving the actual problem, I have several cunning solutions, but I also have doubts as to just how legal they are. If we look beyond that particular problem of "my roommates won't lock all the doors", we come to the root problem of "I'm living in an area in which I'm afraid for my belongings if I don't lock the doors." If someone saw our door open here in Singapore at 2am, they'd probably close it for us and keep walking. You shouldn't need to fear for your house so much in the first place.

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