While Face Unlock on the Pixel 4 is definitely an improvement over both physical and in-display fingerprint scanners, Googleâ€™s 3D face scanning biometric isnâ€™t all it could be. For one, it has limited app support, but even for simple unlocking, thereâ€™s a flaw that could allow someone to unlock your phone without your permission. A new feature rolling out as part of the April Security Update fixes that.
Once the update hits your phone this week, a new toggle will appear inside the Face Unlock tab in the Device Security settings. Itâ€™s called "Require eyes to be open," and as the name suggests, it wonâ€™t unlock your phone unless your eyes are open. That means if youâ€™re sleeping someone canâ€™t get into your phone and if you just want to keep someone out, all you need to do is close your eyes.