If you are looking up what to do if your garage door has sagging springs then you are certainly in need of a garage door technician. You should definitely try not to use the garage door until someone can come out and take a look at the door and springs. When the springs start to sag it can become very dangerous to operate the door because it means that the spring might be on the verge of snapping, and if it snaps the whole door will fall. This is so dangerous we honestly wouldn’t recommend using the door at all until you can have someone out to replace the sagging springs. Your safety isn’t worth waiting!