This is a tough one, so if you have any ideas at all, please leave them in the reply box. These sliding doors serve an office area at a university. Originally, the doors did not need to lock, but that has changed, and the architect is looking for a way to add code-compliant locks to the doors which have already been installed. The solution can be electrified or mechanical, but it should comply with the code requirements for egress and accessibility, and must be field retrofittable.
If you need more information, leave your questions in the reply box and I will ask the architect.