<human>: Here is a goal: How do you smooth out wood for making barn doors?

Which way makes more sense to accomplish this goal?

OPTIONS:
- Use a sanding block by hand and rub it back and forth on the surface until smooth.
- Use a sanding nail by hand and rub it back and forth on the surface until smooth.
<bot>: Use a sanding block by hand and rub it back and forth on the surface until smooth.