The push skill can be found in the haunted house. If you take the adult path, you need it to finish the level. For the child path, you need to backtrack after reaching the end.
Ah okay I tried doing the adult path but I couldn't figure it out that's why child path is easier hehe.
But thanks I'll head back and press some stuff and try n figure out how to open the door
Grandma won't give you a shovel help plz