The world will spend $240 billion on cybersecurity this year trying to buy back something a $2 floppy disk lock gave away for free. To steal the files, you had to be in the building. The lock itself was garbage. A wafer lock you could pop with a paperclip, holding down a lid made of acrylic thin enough to flex with your thumb. Nobody who owned one thought it would stop a determined thief. It didn't have to. The real security was physics. Every attack required a human body standing at that…