I always keep my car keys/clicker for automatic doors on a seperate key chain as my house keys.

Then on the key ring with my house keys I have a spare key to open my car in case I'd lock my keys in it. A little trick my father taught me. Now if you put both set of keys in your purse your kind of defeating the purpose of having two sets of keys....put I don't need to worry about that particular problem.

But roadside assistance or triple AAA is still always a must in my book.