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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.
I’ve already planned to spam the lock button for a few seconds if something like that came up (iPhone) it triggers the emergency settings and disabled unlock without a passcode.
You can also just hold a volume button + power. That will bring up the power / emergency screen and will require a non biometric password for the next unlock.