Otherwise you could allow fingerprinting only within 10 min after the last unlock. This would cover the case where you use your phone a lot and need to lock/un

Otherwise you could allow fingerprinting only within 10 min after the last unlock. This would cover the case where you use your phone a lot and need to lock/unlock faster, while forcing a password entry when your phone gets stolen or used behind your back. You can still be forced to unlock it right after usage, but at this point you might have bigger problems.