Walk Through Walls:

Assign the spade to a shortcut on the D-pad, then put your back against the fence or door you are planning on pushing through. Then proceed to dig with your back against the wall until you have succesfully gone through the object.

Note:You must be on diggable ground to perform this trick.
Note2: If you get stuck in an invisible wall click the left thumbstick to sneak until you can move through the wall.