I am not sure what would be forbidden.
Until sometime in the 80s, you could smoke in a computer room. They certainly did not have a dress code.
We really did not think much about static until the mid 70s and one particularly ESD sensitive technology. The fix was to just bring up the humidity in the computer room. We did go around bonding the floor, clamping ferrite beads everywhere, spraying static suppressor and putting ESD mats under the consoles but when you got the RH up over 50% we didn't see the problems that often. When we did, it was actually just pointing out a real hardware problem. (Usually a poor ground connection on a "trilead", a small signal cable)
This was also when a lot of the urban legends got started.
They even went so far as to come up with an ESD generator to test the machines.
I stopped chasing ghosts pretty quickly, believing it was BS and just fixed the hardware problems!
The next generation of machine did away with trileads and all the static problems went away. That is also when IBM dropped a lot of the silly "requirements" they had come up with in the 70s like the IG receptacle.
To answer the OP, maybe just put a static mat in front of the door so you don't get zapped on the door knob