If you live in the USA, the cops can now legally force you to unlock your phone using biometrics. And I mean I guess they can also illegally (and whose gonna stop them) force you to open your phone with a passcode or pattern as well. But it’s a lot easier for them to hold your finger on a scanner or your phone to your face than make you type in the code.
I have a routine that unless my phone is connected to my wifi, it turns off biometrics and only uses pattern.