I hate to toot my own horn, but this may be helpful, here, so...
Using Calculations & Channels To Create Masks
BioRUST.com :: Tutorials >> Using Calculations & Channels
Of course, the viability of this method depends on the colors of the table(s) and shoes and how much contrast is available.
That being said, the Pen Tool would give you the cleanest (i.e., the most
professional looking) selection.