A lockable container, inaccessible but well ventilated?

[ScienceNostalgia101]

I like to bring my toothbrush to work and brush my teeth at work, but sometimes I forget to bring my toothbrush. I was going to leave one at work, but I can't leave it in an airtight safe or it won't dry properly, and I can't just leave it on a cup in the office because I don't know if my coworkers might use it and I might catch whatever diseases they may have. Is there any lockable container I can put something in, that I need a key and/or combination to access, but that allows anything put in it to dry out?