[Nevadaref]

First merely stepping out of the penalty area is NOT an infraction. In order to infringe the Laws of the Game the GK must extend his arms outside of the plane of the penalty area while the ball is in contact with his hand(s)/arm(s).

In other words, it doesn't matter one bit where the GK's feet are. It only matters where the ball is.

Now if the GK truly does infringe the Laws by carrying the ball out of the penalty area, then the foul is handling. Handling results in a direct free kick for the opponent from the spot of the foul.

I have been told that years ago this offense by a GK resulted in an IFK, but that was long before I was a referee and it is definitely NOT the case today.