Well the way I understand gun laws (which admittedly is not much, but my brother has a few rifles), is that they're to be stored in a disabled state and the ammo stored separately.
So one lock to open the gun safe. Another for the trigger lock (if fitted) or to open the rack that holds them to the safe. Then stuff around installing the bolt. Another lock to get at the ammo, then stuffing around to load it.
It might only take a minute or two, but if you're actually in a home invasion situation I doubt that it's going to do much good.
Biometrics are terrible for a whole bunch of reasons. And have fun trying to remember your combination and enter it when under stressed. And your ammo still has to be stored separately.
I have no problems with guns themselves (well, rifles & shotguns anyway). If people want to hunt, work on a farm or have some other good reason, then fine. They do however need to be stored safely, which generally precludes their use for self-defence.
Not too many people need access to a handgun though. I understand that in Australia you can have/use them, but they must stay locked up at a shooting range. Kinda makes it a bit pointless having one really.