Bar tender?
Else clues• Cell watcher
• Certain custodian
• Con tender?
• Hardly a pen pal?
• Keeper of the keys
• Keeper of the keys, say
• Key employee?
• Key guy at the graybar hotel
• Lockup overseer
• Old West sheriff, at times
• Pen man?
• Prison screw
• Prison guard
• Prison warden
• Prisoner watcher
• State employee
• Turnkey
• Warden
• Someone who guards prisoners