Re: I have a small metal key
Although I can access the flat with just a code number, I tend to rely on that mostly for things like when I've gone to the corner shop (or the pub at the end of the road), or if I'm expecting a visitor. For a longer absence, there's a mortice lock as well.
And on more than one occasion, I've been glad to find a key in my pocket - for example, when the power went out, and I went outside to see if it was just me, or the rest of the building, or the whole street. And realised once I got outside in the cold and wet that, with no power, I wouldn't be able to use the keypad...