Can you make it a game? that was the only thing that worked for us. I would say, Can you be in your seat before I run around the car? Or Can you be in your seat before I knock on the garage door three times? Can you be in your seat before I sing Twinkle Twinkle? It got so eventually he would already be in the seat and say, Mama! You didn't knock three times! Then I would have to knock while he was waiting for me for a change.
The other thing that helps is to plan to take 5 minutes to get in the car. That way you won't be feeling the stress of trying to get somewhere on time, which makes my patience evaporate.
The other thing that helps is to plan to take 5 minutes to get in the car. That way you won't be feeling the stress of trying to get somewhere on time, which makes my patience evaporate.