Surprisingly your garage door just being locked can be causing your problem.
My garage door trolley is stuck.
If you detect a small bend you may be able to straighten it out yourself but anything more extensive will require professional intervention.
Some garage doors have a full lock system which enables you or anybody to lock your garage door from the outside by only turning the handle.
Over time your garage door track can be damaged resulting in a garage door that gets stuck open.
The garage door opener motor will hum when attempting to open or close the door but is unable to travel due to being lodged against the bolt tab.
Typically this is caused by a mis adjustment.
The trolley can become lodged against the stop bolt tab because the door has either opened or closed too far.