There are always ways you can use an analogy to defy what it's trying to get at.
For instance, here's one without any violence. I, holder of the map, simply abandon any attempt to get the key and instead procure a hammer. With the right combination of sturdy implements (perhaps the ubiquitous rocks of our planet's crust) and determination the chest I could find thanks to the map would eventually open to me. I could even simply take the chest in knowledge of it's valuable contents, leaving the key holder high and dry.
Very interesting scenario @a-non-e-moose :)