Do not find Controller method

I was testing some functionality on the project site I'm doing in MVC, but it has a function that is not working anymore. When I access the site it says:

  

"Method App \ Http \ Controllers \ updates :: return_user () does not   exist "

Route:

Route::get("/update_user", "updates@retorna_usuario")->middleware('login');

But I do have this method in the controller:

 class updates extends Controller
{
  public function retorna_usuario()
    {
        $cargo = session('cargo');
        $prontuario = session('prontuario');
        $perfil = DB::table("users")->where('prontuario', '=', $prontuario)->OrderBy('nome')->first();
        if($cargo == "A")
        return view('editar.update_admin')->with('perfil', $perfil);        
        if($cargo == "P" || $cargo == "O")
        return view("editar.update_user")->with('perfil', $perfil);
    }}

What's wrong with the code? I've already used composer update at prompt but it's still giving this error. What should I do?