Looking forward to sweltering temperatures this summer? Now, with this fan fix, you can be marginally less sweltering! You're welcome.
The only issue with this "lock" is that it's less of a security mechanism and more of a test of strength between you and the person coming in. If a 300-pound linebacker gives the door just one good yank, he'll probably send you flying from the toilet seat with who-knows-what strewn all over the floor.