How do I keep someone from taking to door off the hinges?

I have a closet in my home that I need to lock down. I have roommates, who are trustworthy themselves, but not their friends so much. I don't rent so don't worry about anything to do with landlords. The hinges are on the outside and there would be no room to open the door if I switched it. So how can I keep... show more I have a closet in my home that I need to lock down. I have roommates, who are trustworthy themselves, but not their friends so much. I don't rent so don't worry about anything to do with landlords. The hinges are on the outside and there would be no room to open the door if I switched it. So how can I keep someone out of that closet when no one is keeping an eye on it?
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