Melt the butter in a large sauté pan over medium heat. Add the garlic and red pepper flakes and cook for 2 to 3 minutes, until the garlic is soft and fragrant. Pour in the white wine and let it come to a gentle simmer. Add the cleaned clams, cover the pan, and cook for about 5 to 8 minutes, just until most of the clams have popped open. If a few are still shut, give them another minute or two. Discard any that don’t open. Transfer the open clams to a serving bowl and ladle the hot broth over the top. Finish with a squeeze of lemon juice, a sprinkle of parsley, and don’t forget the melted butter on the side for dipping.