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Stop Using Your Face or Thumb to Unlock Your Phone
(gizmodo.com)
This is a most excellent place for technology news and articles.
You can turn that and Face ID off on iOS by mashing the power button 5 times- it locks everything down.
⚠️ WARNING: On android, mashing the power button 5 times calls emergency services.....
There are two ways you can do this on Android currently, but they're not as quick. You can try to unlock with the wrong finger 5 times and it will stop allowing fingerprint unlocks. Or, you can hold down the power button for 10 seconds and the phone will reboot and also disable fingerprint unlocking.