Google will fix Pixel 4 face unlock issue with 'eyes open' update
 

Shortly after Google's Pixel 4 launch last week, the BBC discovered that its Face Unlock biometric security system would unlock your phone, even if your eyes were closed. That would mean that someone could unlock your phone even if you were sleeping,...

https://www.engadget.com/2019/10/21/...ock-eyes-open/