If it is for a door that parts at the middle it would be best to run a taut and rather short chain link through each handle and then lock them together.
How to lock two doors together.
5 stars on the lock quality.
You can lock two cabinet doors with one turn of the key a great convenience.
An exit lock can be freely opened at all times but only has trim on one side of the door.
The other side is covered by a blank plate.
No more fumbling with multiple locks and keys.
Lock two cabinet doors with one turn of the key.
It is good for doors 1 3 8 inch or 1 3 4 inch thick with a 2 inch backset.
The round double pocket door lock set comes with everything you need to lock two sliding doors together.
Cut a hole for this lock according to the template then connect the two sides of the lock.
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Make sure you can close both doors while the lock is in the unlocked position so as not to scratch the finish when closing the last door.
When locked the two pocket doors are tightly hook together.
Fasten them together with screws installed from the inside of each room.
The privacy mortise lock is installed on one door and the strike plate is installed on the other door.
This prevents anyone from the outside that is attempting to get in from parting the doors completely and in effect gives you an added layer of security.
Make sure the lock you choose will fit into any existing holes that are drilled in the door if applicable.
Study the lock configuration how you want it to function trace your own pattern with the tabs fully extended and take your time.
Any mortise or cylindrical lock can be used on a pair of doors just as it would on a single door.