Re: broken key
Make or borrow from a locksmith a broken key extractor. Grind down the smooth back of a jigsaw blade so the height is less than height of the keyway. This makes one type. Second is bend the tip of a diaper pin to create a hook, this allows you to depress the blades/pins of the lock and catch one of the cuts in the broken section to pull it out. Third type is piece of spiral saw blade from a coping saw, fish out the same way. Check the internet, broken key extractor set, and you should find some pictures. Regards, John