[...]Historically, biometric identification has been insecure.

Cameras can be tricked.

Voices can be recorded.

Fingerprints can be lifted.

And in many countries — including the US — the police can legally force you to use your fingerprint to unlock your phone. So they can most certainly point your phone at your face and unlock it against your will.

If you value the security of your data — your email, social media accounts, family photos, the history of every place you’ve ever been with your phone — then I recommend against using biometric identification. [...]

https://medium.freecodecamp.org/why-you-should-never-unlock-your-phone-with-your-face-79c07772a28