Great thing to bring up. As to my safe it's a cheap stack-on I bought at Kmart 15 years ago and only opens by key and could probably be broken into with a good can opener. I just wanted something to defeat small children because while my kids knew to stay away there's no telling for sure how their friends have been raised.
Now as to the digital keypad. My dad has one that's keypad only, I had no idea until he wanted to show me a gun he bought so he put in the code...nothing, he put in what might be the code...nothing he tried one more time...nothing and locked out for 15 minutes. That was when I asked why he didn't key override and he told me the ones with keys were more expensive. I was over a couple more times before he found where he wrote the code down and got it to actually work in the same day.
Stay away from anything you can't open with a key.