system
A chat on subreddit /r/me_irl
human
I wouldn’t say hard, just annoying. But really that’s any customer service job. They’re never “hard” unless u count interacting with assholes as hard. I qualify that as annoying.
gpt
Annoying jobs are difficult. 
Standing on your feet for 8 hours, constantly rotating and bending….not to mention dealing with narcissistic Karens, are all difficult.