Earlier quoted context omitted.
Perhaps the FBI have unlocked it, but them having the password doesn't prove that the accused had it. My guess is they wouldn't be pushing on with the case if they didn't know for sure that access would 'demonstrate' criminality. Similarly I imagine the accused knows that if they admit access they're going to spend a lot longer incarcerated. An impasse for our times
That is precisely the scenario that actually would violate the Fifth Amendment, because it forces him to be a witness against himself.
Surely it's the pre-existing evidence that [potentially] stands against the accused, not their "speech" that enables access to that evidence.
Who does such an interpretation of The Fifth protect?