Need help unlocking wheel lock

My wife has a flat tire that needs changing on her 2001 Avalon, but there is a wheel lock (lug nut) on each of the tires.

Any idea where I would locate the key to remove this? I don't suppose I can change the tire without knowing this.

Welcome tro the AF!

If you haven't already, try looking under and around the spare tire.

If all else fails, get a 12-pt socket that is slightly too small and beat it on with a large hammer, then turn the socket. This usually takes it off.

Thanks - that's where it was. All is (now) well.

You're welcome