How to implement loop on fetched data though group by clause in laravel?

I am trying to implement loop on fetch data but it is giving error that property does not exist.

$SaleOrderProducts = SaleOrderProducts::where('sale_order_id', $id)->get()->groupBy('purchase_order_product.products.id');

I tried this

foreach($SaleOrderProducts as $product)

{
  return $product->products->id;
}

When I just return $products

foreach($SaleOrderProducts as $product)

{
  return $product;
}

then it returns data in this format

[{"id":6,"sale_order_id":2,"product_id":5,"purchase_order_product_id":5,"qty_taken":75,"created_at":"2020-01-31 19:04:05","updated_at":"2020-01-31 22:33:41","purchase_order_product":{"id":5,"purchase_order_id":1,"product_id":5,"measurement_unit":"Cartons","expiry_date":"2020-02-01","created_at":"2020-01-31 19:02:03","updated_at":"2020-01-31 22:33:41","status":1,"initial_qty":454,"on_hand_qty":454,"free_qty":389,"orignal_qty":454,"location":null,"products":{"id":5,"name":"Glass","customer_id":1,"product_type_id":1,"product_status_id":1,"code":"d23123","status":1,"description":"kkd","storage_charge_method":"Per Location","volume":4444554,"weight":545,"random_weight":"Yes","warning_threshold_duration":0,"expiry_threshold_duration":0,"low_stock_notification":"off","low_threshold_duration":null,"stock_selection_method":"Locaiton Efficiency Only","strict_stock_selection":"off","stock_sub_selection_method":"Minimise Storage"}}}]

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