I worked nightshift and the staff are friendly. I was tasked with stocking the shelves. I can understand that this job is not for everyone and it's nightshift so some people aren't meant for that switch.
The only manual labor was placing the boxed products in front of where they're found in the isles. That part takes two hours and is meant to be done at a quick pace. Once you've spread everything, you start opening the boxes and placing the products on the shelves. This part should also be done quickly but if you have good time management, depending on how many boxes there are for that night, you can either take your time, or pick up the pace and finish early after helping the other workers.