I need help with linq

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C#

Hello I just started learning about LINQ.
I am trying to return all products which are out of stock (UnitsInStock == 0)
The code does not compile. Any help would be appreciated. Thank you!

What I have tried:

public static IEnumerable<Product> ProductsOutOfStock()
        {
            List<Product> products = Products.ProductList;

            IEnumerable<int> query = products.Where(p => p.UnitsInStock == 0 ); //CS0266

            foreach (Product p in query) //CS0030
            {
                yield return p;
            }
        }