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Maybe if you live in the US (and quite a few other countries), but if you live in the UK, you can get a prison sentence just for not disclosing your encryption keys: https://en.wikipedia.org/wiki/Key_disclosure_law#United_King...

Would the defense of "I just changed my password and don't remember it" work?

Yes. You'll stay in jail until you remember it. /s

UK doesn't have a concept of presumption of innocence. So guilty until proved otherwise