Has anyone been in locker room where they had female staff clean while you were in there?
Not exactly that. The switches for the pool area lights were in the men's locker room and the female swim class instructor had to come in to turn the lights on.
I was 13 when I started using the locker room and gang showers in School. I was hesitant at first but I accepted this new experience and became comfortable in getting naked and showering with the other boys in gym class.
I use the locker room for what it was made for in changing clothes and showering. I have no problem in getting naked while changing and using the showers without having to closing the curtain. I use this time to set an example that being naked in the locker room is acceptable and there is nothing wrong with it.
Much later in life I discovered the Korean Spa where nudity is required in the spas, steam room and sauna including the locker room and showers. It feels great to walk around naked and enjoying the facilities the way they were designed.