Three-Year-Old Home Alone

So I'm getting ready to take the kids to day care yesterday morning. My husband has taken our oldest to kindergarten and gone to work. I start the car because it's 30 degrees out. I take Jack, my 11 month old, to the car and shut the door to my house on the way out so the exhaust smell doesn't go in the house (don't worry, the garage door is open). Mackenzie, my three year old is in her room putting "wickstick" (lip gloss) on. I put Jack in his car seat and walk back towards the door to get Mackenzie. All I hear is "Mommy, don't leave me." I get to the door and it's locked.

The lever works fine, but Mackenzie has locked the deadbolt. I don't have a key to the deadbolt. I don't have a key to the front door. I don't have a key to the back door. Now Mackenzie really thinks I'm leaving her. She starts to get upset.

"Mackenzie, unlock the door."

"Me can't."

I hear her trying to unlock the deadbolt.

"Mackenzie, do you have something in your hands?"

"Yes."

"Mackenzie, put all the toys on the ground and use two hands to unlock the deadbolt"

"Okay." I hear toys dropping. "Me can't unlock."

"Mackenzie, please try again with two hands."

"Mackenzie?" Silence. "Mackenzie?" Silence. "Mackenzie?" Silence. Great, she got bored and went to go play. "Mackenzie?"

"Yeah?"

"Hang on a minute." I call my husband, who I'm sure has a brillant idea. It takes a few minutes, but he figures out that she should try to open the front door because it's easier to open. She does that on the first try and runs to my arms for a hug. This morning's catastrophe is averted.