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Would you happen to know what the rule is on Yubikeys and the like? I assume if it's PIN-protected, it counts as a password but what if it's just set up for tap-to-unlock?

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Not a lawyer and do not know your jurisdiction.

I extrapolated this as anything that is in the mind (PIN, password, some secret) cannot be demanded, while anything outside of the mind, biometrics, geolocation, physical object (key) can.

Again, I am just a hairless monkey smashing rocks together. Consult experts.

In the US this is a pretty good nationwide summary.

Of course they can use that. The Fifth Amendment protects the right to not testify against yourself. You can keep silent. That's it about self-incrimination. The government can seize any physical object and do essentially anything it wants with it with a warrant. They can physically decap a TPM and read the security key if they really want to.

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