https://arstechnica.com/gadgets/2020/04/ios-13-5-beta-lets-you-easily-unlock-your-iphone-while-wearing-a-mask/

Apple's Face ID method for authenticating on recent iPhones offers a number of security benefits, and it's a neat trick to boot. But in a pandemic-stricken world where many people either opt to or are even required to wear protective masks, users have discovered that Face ID doesn't usually work when they need it to. Those masks interfere with the iPhone's ability to read your face, and at the moment, there's no easy solution.