A Biometric lock is a lock that uses a person's physical attributes to authenticate them. It may also use non-physical attributes like voice recognition, however options like fingerprints, iris scans and facial recognition are more common in a security scenario.
A biometric device is a security identification and authentication device. Such devices use automated methods of verifying or recognising the identity of a living person based on a physiological or behavioral characteristic. These characteristics include fingerprints, facial images, iris and voice recognition.