How do you fix a jammed dudley lock?

To fix a jammed Dudley lock, first ensure the key is fully inserted and try gently wiggling it while turning to see if it can free the mechanism. If that doesn't work, apply a lubricant like graphite or silicone spray into the keyhole to loosen any debris. If the lock remains jammed, disassemble it carefully if you're comfortable doing so, or consider calling a locksmith for assistance to avoid damaging the lock. Always ensure you have the proper tools and safety measures in place when attempting repairs.