How do you get them both from the car or sidewalk through the door?

Hey everyone, joining 2 under club soon and our oldest will be about 20 months. We live in a hillside home where we park on the street or in our garage on the street and then go up about 3 flights of stairs/winding pathways to our house. It's been totally fine with one but I can't quite figure out how it would work with 2. Anyone have similar living situations or live in apartments where you take stairs and have some tips? How do you manage with two?