Brake pedal won't return

There is a special "shoulder" bolt that goes thru the pedal and pushrod.
Often the wrong bolt, or a washer was added, or just gunk gets on that bolt, and it binds on the return.
Try loosening the nut/bolt thru the pedal. If that eases the problem, find out why it's bindin and repair it.
Don't just leave the bolt loose, fix it.
Good luck