I had a gun safe with a fingerprint reader unlocking mechanism next to my bed at one time. When it worked, it was kind of cool. The problem is it turns out a lot of things affect the ability of the scanner to read fingerprints. For instance, humidity. So while the reader might work fine one day, on a drier day, it would not work at all. Or vice versa. This made the gun safe useless. If I needed to get in it in an emergency, I needed to get in it immediately. Being delayed a few minutes - sometimes having to go and get a washcloth to clean the scanner or whatever it took to make the lock mechanism open, was inconvenient. Being delayed in an emergency could prove fatal.
So I got a different gun safe, and I will never use biometric verification for anything involving firearms again.