Davideber

There are three kinds of locking mechanisms used for home safes,
1. Lock and key system
2. Pass code system
3. Fingerprint system
4. electronic home safe
The safes with above mechanism and also fireproof is an added advantage. You may check online for price comparison also.

Check out the Sentry D888. It's bigger than you're looking for but I'll say this, they're never big enough. It's 6 cubic ft 37h 21w 20d

This safe weights 200 lbs, bolts to the floor in a closet. It is not fire nor waterproof. It's a security safe. I keep all my important papers in a fire safe box inside the safe. You could do the same for watches, cash etc.

If your looking for a safe with those dimensions that's fireproof your looking at 500lbs and $1200 bucks. Ft Knox makes some really nice ones.

Go on the Sentry Safe website and check them out.

One other thing, I went with a combo instead of an electronic keep pad. No batteries and less to go wrong.