How to use Model in function parameter to reduce code in laravel?

This is how i am trying to update record in my laravel function which doesn't work

  public function completePacking(SaleOrder $saleOrder)
  {
    $saleOrder->update(['status' => 'Draft']);
  }

it is working

  public function completePacking($id)
  {
     $saleOrder = SaleOrder::findOrFail($id);
     $saleOrder->status = 'Dispatched';
     $saleOrder->save();
}

i want to use first method because it is less code but that is not working

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