Folding Lock

What type of lock can I put on a bedroom or closet door in a roommate situation, without much damage?
Is there something I can use which does not require a lot of hole drilling? I really don't need the lock for optimum security, just enough to keep nosey roommates at bay. They wouldn't go so far as to bypass a lock. Most likely I'll just use it for the closet doors where I'll keep personal papers etc. The lock will be for folding closet doors that open out, or a regular closet door that you pushes close with a turn knob. Thanks.
If it's a turn knob closet i would suggest just replacing the knob. You can buy a door handle with key at home depot/lowes for less than $10 (since we're not talking high security) and just replace the old handle yourself. No drilling holes here because you can always put the old handle back when you leave.
http://www.homedepot.com/prel80/HDUS/EN_US/diy_main/pg_diy.jsp?BV_SessionID=@@@@0332074477.1174406216@@@@&BV_EngineID=ccceaddkhgkmflmcgelceffdfgidgnj.0&CNTTYPE=PROD_META&CNTKEY=misc/searchResults.jsp&MID=9876&N=2984+4078&pos=n20
(lock in link is actually $13, but in store there are always sales)
For folding doors, I'd suggest a simple latch like you see on a gate, with a pad lock. You'd have to drill small holes to install, but nothing that can't be filled and painted over.
http://www.lowes.com/lowes/lkn?action=productDetail&productId=202347-382-462DCCSEN&lpage=none
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