1. Find an apple tree
2. Crouch in front of apple tree
3. Press and hold 'w' and then immediately press f11
4. Keep holding 'w', spam 'f' on the apple tree until you have 50 apples
5. Keep holding 'w', and open your inventory.
6. Keep holding 'w', and right-click, select eat on each apple.
This method cancels all animations. You can pick and eat 50 apples in less than 5 minutes.