In Little League, the batter is out if they hit the ball with one foot completely out of the batter's box. There is no penalty if they don't hit the ball.
There could be a penalty on the pitcher if the reason the batter has a foot out of the box is because the batter didn't finish stepping into the box. A quick pitch is an illegal pitch which counts as a ball.
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If the batter hits the ball and their foot was out of the box at contact then the ball is immediately dead and the batter is out.
If no one is on base then a ball is awarded to the batter. If a runner or runners are on base then they will be moved up one base and a ball is awarded to the batter.