https://wccftech.com/pixel-4-face-unlock-works-sleeping/

The Pixel 4’s Face Unlock feature would have been a worthy competitor to Apple’s Face ID, but it looks like Google forgot to mention one crucial detail. Apparently, it’s possible for you to unlock the device, even when your eyes are closed, and that’s definitely cause for concern for a lot of customers.

BBC reporter Chris Fox, who was testing out the Pixel 4’s facial recognition capabilities, shows via his Twitter handle how easy it is for him to gain access to the device, even when his eyes are closed. According to BBC, the test was repeated multiple times on different people while in default mode, and this apparently got the same results. Do keep in mind that Google has a setting labeled in Pixel 4’s face unlock menu, stating that your eyes need to be open in order for the face authentication to start.