So, stuff to do, happily re-heating my ginormous cup of coffee in the micro-half-time oven and when I try to get it out.. nuttin.
I push the door release, it has no movement.
There was a post a couple weeks ago, but the OP didn't let us know what he did about it, someone suggested getting rid of it and buying a replacement microwave.
The entire job took me about 30-45 minutes.
Remove the unit, set it on the counter and start removing the 20 or so screws. The problem was one of 4 plastic catches bent in a little and jammed the inward action of the button. I bent it out a tad, used some chapstick for lube on the moving parts and.. 'Bob's your Uncle'
had to reheat the coffee...
Oh, the last picture is the pile of cash you will save by doing the easy repair.
https://goo.gl/photos/c9daiX9fmCLrcCB58