Got a customer, friend of mine, actually, who has 2 sliding gates into the back storage area of his shop. Locks are Adams-Rite 1850 (or equiv.). Shop personnel don't always remember to lock the more remote, less used, back gate and sometimes he will find that it has been left unlocked (but closed) for the weekend. A nuisance for personnel to get out of the truck and check to see if the gate is actually locked, so it occasionally is overlooked.
He originally asked me about key-retaining cylinders. As far as I know, this is not possible using the existing locks. And even then, personnel could just lock the lock so that they could get their key out, without closing or latching the gate.
I understand that someone used to manufacture a self-locking lock that could be used in such an area. The "bolt" would be shaped like a spear point and when the gate was closed, it would lock.
So, does anyone know if such a lock exists? And, if not, what sort of solution would you suggest. The gates are large and heavy, square steel tube construction.
TIA Ralph