As I understand it, we are not required to incriminate ourselves. e.g. we can not be told or forced to confess, similarly we cannot be told to open a lock. In f

As I understand it, we are not required to incriminate ourselves. e.g. we can not be told or forced to confess, similarly we cannot be told to open a lock. In fact, there is no way to determine wether you indeed do know (or remember), or do not know/remember the passcode prior to forcing you to hand it over. Any punishment for not cooperating may be a punishment for not remembering, or worse, not even ever knowing the passcode. But we can be be 'used' to build evidence. For example, being detained and forced to stand in a line-up so that a witness may recognise you. Or having your speech recorded, so it may be compared to a criminal telephone recording. Or having your fingerprint taken to be compare to fingerprints found at a crimescene. Having your key be taken to unlock a vault which is suspected to contain stolen items. Or indeed, having your finger or face scanned to unlock the same thing. These seem like fundamentally different things, one which may lead to improper judgements, another which leads to generally reasonable judgements.