You did not give the brand and model number for the opener. But the problem is most like a stripped gear set, loose set screw, or broken belt.
The garage door, by it self is suppose to be balanced so that it can be opened and closed easily.
The opener is should not be needed to work the door. It is only a convinence.
If after you trip the release and you can’t open or close the door then you need to get the door fixed also.
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