[Leah Frances]

Wow you guys don’t have a garage door latch on your doors? Up here all garage doors have a sliding latch which would be installed by the garage door manufacture and the latch slides right into the track to lock the door.
they are like $ 5.00

We have one of these on our garage doors. It connects to a handle in the center of the door and has a lock - when we bought the house we had it keyed the same as our entry door locks.

But my garage isn't connected to my house; so it's not quite the security worry....

 

[Leah Frances]

The one I mean is installed on the inside near the track and slides into a slot in the track. No key required but it does have a hole to put a pad lock if needed.

This is what you have

these have cables

Yeah, mine is the same, except it is connected by bars to a handle in the middle of the door. Turning the handle rotates the 'tabs' out of the slots in the track. I'll shoot a pic tomorrow. Too late to go tromping out to the garage in my PJs.