It wasn't outside the door Peter stopped. Or even outside the elevator. No, Peter's teleport had brough he and Willow just outside the building the Skywalkers resided in. Anakin was a Jedi, after all. He'd be able to sense them coming. And first, Peter was trying to get as much of his geek out as he could.
Which meant that he was currently jumping up and dow, eyes squeezed shut, laughing almost maniacally. The surrealism of it was nearly overwhelming. He caught one of Willow's hands and laughed. "We're going to go see the Skywalkers, Wil. And their new baby!"