This lock lube is literally THE BEST for un jamming a lock. Tried wd40, tried fast release spray, and neither even budged it. Had a boot lock on a Mercedes that would not move-the key wouldn't even turn a millimetre. A couple of sprays of this stuff and 10mins later the key was turning. Saved us a bill from Mercedes for hundreds to have a new lock fitted and synced to the central locking system. I couldn't recommend this product more. Very small can, very big effect. You don't need much, you just need to use this to free anything that is jammed or sticking.