ok to me that looks like a solenoid right by the key. your actually pushing on the end of the solenoid when you push the "button" to release the key manually.
so i would think that it takes power to lock the key in and there must be a spring or something to release it, so if im right it most likely just got some kinda buildup or pardon the techical jargon but some kinda "stickyness" thats keeping it from letting the spring release it. im gonna try some sort of lube on mine. as thats the problem alot of times with solenoids on the cranes i work on all day.
its got to be getting triggered because when i push it up it stays up till you turn the key back on then it pushes my special solenoid pushing tool (golf tee) back out. anyone see holes in my logic?