IGNORE THE POTATO LOBBY. No spud will help you. Did I write this already? You'll just get potato juce down your forearm, and your arm will fall asleep from all the pointless jamming and turning.
EMBRACE THE DUCT TAPE LOBBY.
Get your self a wadded up piece of Duct tape or electrical tape. Jam it in the stuck cylinder. Oh, first turn off at least the light switch if not the breaker in the fuse box. Let's not tempt fate. Anyway, jam it in and start to turn it lefty loosey. Ta daa!