Garage doors like anything else with moving parts require periodic maintenance.
Unlocking garage door track.
Lodged garage door track.
In order to unlock your manually locked garage door you just need to turn the knob or large handle located in the middle of your door.
Use a key padlock on the vertical track to prevent the door from being opened manually.
3 lock garage door vertical track.
You can also use the operating lever.
If the garage door vertical track is locked the door cannot be opened.
Locking and unlocking from the inside.
If you install only the sk7115 you can lock and unlock your garage door from the inside.
To lock it push out the sliding bolt.
To open it up all you need to do is thread a coat hanger or hooked piece of wire through the top of the door and open the emergency latch which can also be done by the rope many emergency latches.
The sliding bolt should automatically spring open.
Your jammed garage door can be caused by something as simple as an obstruction in the track.
Check to see if anything a shovel broom etc fell and is now stuck in the track that is causing it to be lodged.
To unlock it push the release lever away from the track towards the center of the door.
There are two bars running from the handle that release the door to be unlocked manually and there is also a button on it which moves the bars across to lock the door.
This is an easy fix by realizing this problem and then unlocking your garage door.
Garage doors get a lot of use which is one of the primary causes of the problem.