I collect and repair old payphones, even have repaired many that were locked. I can open locked WE style payphones and have replacement locks that have keys.
I am offering here (pictured) original vault locks for GTE style payphones.
I also have upper housing keys for antique 3 slot payphones. Original upper housing and vault locks with keys for vintage Western Electric payphones.
I have many parts for payphones in general. Let me know what you need.
JUST SOME EXAMPLES
Locks
Vault doors
Face plates
T keys
Sings
Coin scanners
Boards
Handsets
Coin relays
The coin box that goes in the vault with the self locking lid