Warning: The following methods are for expert-level cheaters only. Proceed with caution, or don't say we didn't warn you...
Claim your keys are in a "safe" location, like a friend's house or a public restroom. Deny all evidence to the contrary.
Read more about this technique.
Calls a friend or family member and claim you're in an emergency. Bonus points if you can convincingly cry.
Learn the art of fake phone call mastery.
Leave your phone on the charger for hours, then claim you were simply "recharging" and didn't mean to stay out that long.