Log into your phone or computer or account with a password and the camera taking a picture of your face. However, the face picture is not used for face recognition -- that is hard and error prone -- but merely a log of who used the computer. There remains at least evidence of unauthorized users who have obtained the password (unless they delete the log).
The face recognition software merely needs to recognize that the camera is looking at some face, not necessarily your face. It could also require the user to yawn then grin to thwart an attacker substituting a static picture.
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