If you push the button on the remote control and the door doesn’t open, it might be a broken spring. Most doors weigh 150-300 pounds and the springs lift all the weight.
If a spring breaks and you need to open the door immediately, you will have to lift that weight yourself because most garage door openers are not strong enough to do it.
Pushing the opener button on a door that has a broken spring will damage the door
In this video a garage door with 2 broken springs gets destroyed when the electric opener tries to pull the door up. Without help from the springs, the door collapses.