We were in this position with our back door key too, until the key snapped in the lock of the front door and the cheapest, easiest option on a bank holiday morning with a small child was to break a window to get in and go back out through the back door...
Now I have the back door key on my ring.
We also really cheap nasty locks (rental house) that might fail at any given time.
Do you dislike it more than paying for an emergency locksmith is the key (fnar) point really!
We have a spare set of keys with a close neighbour just in case we lose ours, but having the backdoor one is great if you have a really bad run of luck with the front door!
We were in this position with our back door key too, until the key snapped in the lock of the front door and the cheapest, easiest option on a bank holiday morning with a small child was to break a window to get in and go back out through the back door...
Now I have the back door key on my ring.
We also really cheap nasty locks (rental house) that might fail at any given time.