Perfect solution (Score 0, Redundant)

Hire a student to do this. I was a student in a university and I'm rather erked at the number of jobs that used to be for work study, and are now being phased out thanks to half baked tech replacements. A homemade system will never be as secure as having a human being there to verify ID and record who checked out what. A work study student would cost you nothing, and give someone the ability to collect their financial aid. Why are we trying to replace jobs a person could do in a recession?