One of our Universities does this as well.
We installed the locks for them using window / sliding door type pin locks. Basically just had to drill a hole through the side case of the machine and into the cassette. The pin then locked the drawer from opening once slid through.
It is a pain though because only certain people have access to the keys and it has previously taken some time just to remove some poorly stacked peper which was causing the jamming.
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