My Job Is To Yell At You

The people, are in a line.
The line, is in a building.
The building, is guarded by security.
Security, has the walls lined with signs.
Security wants you to read all of these signs and move quickly through the line.
If you miss one of the instructions, security will yell at you.
Security will repeat the yelled words; this is called berating.

The people in this line are headed for jury duty.
One of the persons that was berated was me.

In turn, I fumed and ranted (mostly to myself).
I eventually calmed down and wondered what the berator's job description must look like.
Let's review:

1. Effective verbal communication skills
Well, I did what I was told.  So, check.

2. Must be knowledgeable of all policy and procedures.
Berator was quick to remind me of procedures and repeated it clearly and loudly. So, check.

3. Must maintain good working order of security conveyor belt and x-ray machine.
Berator recognized the Dunkin' Donuts bag that I placed on the conveyor belt may have coffee in it. Berator's suspicions were correct.  Berator assured liquid did not spill in the x-ray machine. So, check.

4. Must be able to facilitate the movement of hundreds of people in a short period of time.
I did not spend any time lollygagging around security.  I wanted to leave the berator's presence immediately. So once again, check.

5. Nothing in job description mentions how job is accomplished.
I guess, check.

Conclusion
I see jury duty as a job, work if you rather.
No one should be treated poorly at work.
I don't think I should have been treated poorly.

But what if it's part of the job description?