Why can't the password lock be opened?

Dry fingers. After entering autumn and winter, the weather is getting colder and colder and the air is getting drier, especially in the morning and evening. I didn't wash my hands clean. Hands are not cleaned, and there are colored oil stains on fingerprints, which is not conducive to the collection of fingerprint images. Finger injury or serious fingerprint wear, finger injury or serious fingerprint wear, leading to blurred fingerprints, fingerprint lock can not identify fingerprints. The battery with fingerprint lock is dead: just replace the battery. Fingerprint lock itself: need to be repaired or replaced.