Cylinder lock with key snapped off inside it, at least 2mm inside, no chance of gripping it. Tried hitting the lock to move the stub enough to grip it; not a chance. I can only see 2 screws on the side of the lock, but lock won’t budge when I undo these. Most locks I have seen have at least 3 screws, where is the last one likely to be hidden? There is a cover around the lock on the outside, what is the likelihood that it is under there? As it is accessible from the outside I have not undone it yet as the screws that hold this in place are hard to get to and painted over so many times that the thread is hardly visible. No brand name on the lock, looks rather old and cheap. Would have happily broken the old piece of junk out and replaced with good quality new one but practical reasons make this the last option unfortunately.