Toyota key won't turn

I've been having this problem for a number of months. The key won't turn in the ignition. I found that I had to jiggle the key back and forth and kind of shove it in. And if that didn't work, turn the key upside down. Eventually it worked. But now a new problem. The key wouldn't insert all the way in. Had to try pushing it in and out a number of times and eventually it worked. I went home and sprayed it with some silicon spray. And now the key goes in easier. But when I tried the old (less used key) it wouldn't turn. And only the more worn out key works putting it in one way. Though even that doesn't work sometimes on the first crack. Google. Sounds like it's the lock cylinder. I think I'll take it to B&A and see what they say.

[8/20/12] Took it to B&A and they said there's nothing they could do, but that the keys looked worn out.

So I went to City Mill and made a duplicate of the key that was in mom's closet.  That seems to work better.  But now that the lubricant has settled in, I can put the old key in and turn it after jiggling a couple times.  The other old key still doesn't work though.  I'm keeping the new duplicate key on my keychain but trying not to use it so I don't wear it out.  I'm also keeping the other old key on my keychain too.  I can still use it to unlock the door.