Despite the 7 great mask-creation tools in Lightroom (I used iPad version), yesterday I needed to create a mask that they couldn't handle, so I had to send the photo to Photoshop, where the Magic Wand created my mask with ease. I've attached the photo in question so you can try for yourself. I wanted to mask everything except the sausage and bun.
This situation does not occur frequently for me, but often enough that I'm making this request. It would be SO awesome if you would add a Magic Wand mask tool to Lightroom. Thanks!