system
A chat on subreddit /r/NoStupidQuestions
human
Yep, dudes just standing in the walkway preventing people from entering and exiting the fitting rooms.

OR

Dude is nearby the fitting rooms but at a spot that is mostly out of the way and they can move if they're blocking someone still. Quit being so dense.
gpt
Most fitting rooms I've seen have seating just outside them for people to use while whoever they are with are trying on clothes or plenty of room to be out of the way