You will have to call a professional garage door service tech.
My garage door will only open a few inches.
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If the door is working properly it should be easy to lift by hand.
A broken torsion spring will also cause the door to slam closed instead of closing gently.
In the mean time you should be able to open it with two strong people and then once it is open have a third person set it ladders at each end and carefully lower the door onto the ladders then pull your car out.
In order to fix this you ll want to make small changes to the close limit setting until the door opener knows to stop once the door has reached the floor.
Garage door only travels a little way and then reverses does your garage door only travel a little way 6 inches or so and then reverse.
This indicates that the springs torsion springs in the case of the photo above are working properly and are not the issue.
If this isn t lit check for a tripped breaker in the main panel or a tripped gfci outlet.
Most garage doors from the past 15 20 years have a photo eye which detects if a person or object is blocking the door from lowering all the way.
We will now want to take a look at the garage door springs.
Disconnect the opener from the door itself like so and open it manually a few times.
If the door does not open manually.
If your garage door is closing fully and then reversing to open again then it may be due to a problem with the close limit switch.
My garage door opens about six inches and stops i press the my garage door opens about six inches and stops i press the button twice so it will stop going down and then is goes up another 6 inches or so.
If the door starts to open but won t move more than a few inches the torsion spring may be broken.