If you're looking to lock your hair with a crochet hook, there are a few things you'll need to keep in mind. First, you'll need to make sure that your hair is completely clean and free of any products. Next, you'll need to section off your hair into small sections. Once you've done that, you'll take your crochet hook and insert it into the first section of hair. From there, you'll twist the hook around until the hair is tightly wound around it. You'll then continue this process until all of your hair is locked with the crochet hook.