Yes sudden key misfunction is a definate sign an amateur has tried to perform a non destructive bypass but having no skill or virtue has damaged the pin sets. depending on where you are cheap fibre optic scope that fit in your keyway can be purchased and marks will appear on the pins where logic tells you the key cannot touch. Gadgets Direct in australai sells a cheap one that will fit medium but not super small keyways, but I would inform the police, as I said Yes it is a sign of surreptitious manipulation by a skunk.