If you do this on purpose after asked to unlock your phone you will probably be charged with destruction of evidence or something like that.
However, while a court is (afaik) able to ask you to put your finger on the fingerprint reader, you do not need to tell them which of the fingers the correct one is. So instead of purposely using a wrong finger, I'd ask the court to explicitly tell me which of my fingers I should use to unlock the phone.
However, while a court is (afaik) able to ask you to put your finger on the fingerprint reader, you do not need to tell them which of the fingers the correct one is. So instead of purposely using a wrong finger, I'd ask the court to explicitly tell me which of my fingers I should use to unlock the phone.