Plugin Dev

Hello
I'm just start coding Java and i need help.

I try to make command /lobby that will teleport you. But it's don't work.

I have problem that it teleport on coordinates, but not in the world "Lobby". If you know please help!

Code:

 public String com1 = "lobby";
    @Override
    public boolean onCommand(CommandSender sender,Command cmd,String label,String[] args) {
        if(sender instanceof Player) {
            if(cmd.getName().equalsIgnoreCase(com1)) {
                if(sender.hasPermission("lobby.use")) {
                    Player p = (Player) sender;
                    sender.sendMessage(ChatColor.BLUE + "You teleported in lobby!");
                    Location loc = p.getLocation();
                    World lobby = loc.getWorld();
                    loc.setWorld(loc.setWorld("Lobby");
                    loc.setX(24.9966);
                    loc.setY(136.0);
                    loc.setZ(-15.0075);
                    loc.setYaw(0);
                    loc.setPitch(0);
                    p.teleport(loc);
                  
                    return true;
                } else {
                    sender.sendMessage(ChatColor.RED + "You don't have permission to use that command!");
                }
            }
        } else {
            sender.sendMessage(ChatColor.RED + "Just players can use this command!");
        }
        return false;
    }