Could you not then argue the same for data encryption? Bruteforcing it would be the equivalent of a blowtorch in that case. Would that not then mean that they can compel you to give the key/password?
A blowtorch can open such a safe in <1 day. Depending on the encryption, cracking it in a year might be impressive. And that assumes they can prove it's even there.
We'll figure out how to read people's minds before some TLA brute-forces a volume encrypted with layered AES-Twofish-Serpent. If you're going that far, you might as well just dump the 5th Amendment now.
