Internal Glass to Glass Door Lock, accessible from both sides?

We had something similar in the office where I used to work
I do remember that a bit fell off and was a pig to find a replacement.

Look for commercial door furniture
 
If you already have the door then it'll be a non-starter - for it to work both sides the door would need a hole through it and the door will be tempered which means you cannot cut or drill it. The only way you could do this I can think of is with a magnetic lock and an RFID type reader (that might even work from both sides of the glass?)
 
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