Does the door slide on the inside or outside of the room? If its on the outside, http://hangingdoorhardware.com/pocketdoors/barn_door_track/gate%20hardware.html has hardware for locking barn doors. Those locks are sold at multiple places.

If the door is installed on the inside of the room you may need to figure out a different latch and make it work. Possibly a latch for a sliding window.

Appreciate the feedback. The doors are on the internal side, also are feature doors, so looking for something to enhance the overall appearance.

I changed my mind on the sliding window latch, I dont think that will work. How about a decorative hook and eye latch? https://www.google.com/search?q=decorative+hook+and+eye+latch

Match the hardware color to the track and it should look good.