Can bike tools replace keys to your apt?

[CycleChic06]

But i think you have a better idea, to put a spare key somewhere on the bike - matter of fact i think i'm going to go put a key in the underseat bag right now so i dont forget!

Wow, that's such a good idea. Being locked out is always a fear of mine. I don't know why I never thought of putting a spare key in my underseat bag. Thanks for the good idea!