system
A chat on subreddit /r/NoStupidQuestions
human
Before AND during?!  And you called it a shift, which implies a blue collar job.  So, you didn't work 8-5, unless you were pounding alcohol in the wee hours.  And you could either drink at work (?!?) or hid it somehow, or didn't work in an office/building.

TELL US HOW!!
gpt
I would put money on bartender, it can be quite easy to drink on the job depending on the environment you are in