You can take the Skyliner from Pop to CBR, transfer to the Epcot line, then walk from that station to the YC. If you finish your meal and leave YC before Epcot closes (or within about an hour after it closes), you can reverse the process to return to Pop. If Epcot has been closed for over an hour by the time you finish, you’ll need to take rideshare or a taxi from the YC front entrance back to Pop, because the Skyliner will most likely not be running that late.