VT, many years ago we went car camping with a few families, some of us brought bikes. One of the dads went to the washroom just before we were about to head out on our bikes, locked his bike, and when he came back couldnt get it unlocked. After ages trying all the combos, etc etc, we finally borrowed a hacksaw from the park people and sawed through it in an amazingly short time (in fact we were all frankly flabbergasted in how short a time-especially him as he had bought it recently with the assurances that it was very strong)

So you are not alone...