Chosen Solution
Some foreign things were put in my padlock. We remove most, the key goes in, but can’t open it.
Try spraying WD40 into the lock and/or try can’ed air. Either one should flush out any small pieces still inside the key slot. Did someone put something into the hasp part of the lock? Are you sure you have the correct key? If either of these are true you may end up needing a locksmith or a bolt cutter.
It is locked can not open.