I have both my phone and laptop set up to unlock via fingerprint recognition.
Sometimes this will fail if I have had a shower or been doing some dish washing shortly before. Yesterday I was using a sanding block for period of less than 30 minutes. (wet and dry sandpaper bonded to 4 sides of a rectangular foam block). The fingerprint recognition has failed on both devices since :( I presume that I've flattened the ridges on the fingers of my hand by holding on to a sandpaper surface.
Both devices have a secondary entry mode to allow unlocking.