A simple way to do this is to put a small piece of wood inside the opened track which will support the shape of the track.
How to put a garage door wheel back on track.
The pliers act as a stop.
With that working properly you have successfully put your garage door back on track.
Now you can remove the wood and vise grips and your garage door should function properly.
Ensure that the vertical parts of the track remain straight.
Hammer the bent track back into the correct shape against the wood until it has returned to proper alignment with the rest of the track.
When all the rollers are back inside the track you can close the opening in the track.
Use a rubber mallet to tap the edge of the roller back into the track.
Locate where the roller popped out of the track.
Once you locate where the wheels on the door are jumping off the track snap locking pliers underneath the door on one of the tracks.
Open the door while holding the roller against the track.
If this doesn t work proceed to the next step.
Open the door manually.