My puppy is lethargic and won't eat after his first crate stay.

Apollo is so cute! He may have been stressed by the crate and exhausted himself while you were gone, hence why he wants to just rest now that you are home. I would just give it some time and monitor him closely. If he doesn’t want to eat later today or is still very lethargic tomorrow then I would have his veterinarian evaluate him. I would watch him for signs of vomiting or continued lack of interest in eating if he could have ingested portions of the shoes or furniture. and if he bounces back maybe he needs a gradual introduction to the crate where you start by just leaving him for short periods. Let us know if you have additional questions !