Assuming this pianos keys were made with Cellulose Nitrate, the unpopular replacement for Ivory, then: You put one of the keys in the key hole then you start smashing that key with the other piano keys, and as we all know Cellulose Nitrate is very unstable and flammable and the collision between the two keys creates an explosion blowing the vault door off of it's frame. Leaving you to walk right on through.
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