Not to be a complete ***, but you don't have a spare? I usually have three or four in various locations, including one in my wallet. After having a nissan with the thinnest key you could possibly imagine (it broke off in the door twice!) I learned to keep a few for such occasions. When you get your next one cut, make a few more!

I'd also use a tri-sided file for handcutting keys, but that's just me. Plus one for Ace.