No I don't. I just try my best to ensure that I don't look myself out or other members of my family have keys. I won't feel comfortable having a spare key on the outside when I'm not there. I rather to give it to a neighbor while I'm out.
We use too, until we changed our front door, now i keep asking to have another set made up, it hide 'in the garden', but we haven't done so as yet. I guess we've had the 'new' timber door for about 5/6 years now. So I now try & remember to take my set of front door keys whenever we go out, just in case my husband looses his house keys, which are on his keyring with his car key.