Taz 5 Screen Lock

Hey guys,

I just helped my school get a Taz 5 and they were wondering if I can incorporate a lock for the lcd screen so that random students cant print with it. We already have a physical lock on the printer but no software lock.

If anyone can help me or guide me with what parts of the Arduino code I need to mess with to add a lock that would be great.

I do have coding experience.