Use the Rubber Mallet to smash a hole in the dome and escape in the Greenhouse.
How to get Rubber Mallet
Once you get inside Sully’s you’ll find a robot in the right corner. It’s Sprocket! Ring the bell on the desk next to him to wake him up. Then go pick up the rubber mallet from the junk box in the left corner.
yay i’m 1st 2 comment.