I don't like the idea of biometric locks, or even electronic combo locks for that matter.
Heavy steel, simplex mechanical lock (seems to have been around forever), this is what I'd get
https://www.amazon.com/Fort-Knox-Shotgun-Safe-Rifle/dp/B01BW262GU/ref=sr_1_6?s=sporting-goods&ie=UTF8&qid=1523475048&sr=1-6&keywords=fort+knox+rifle