In the 20s, any quality office building would have had an elevator operator for passenger traffic as a necessary part of presenting a desirably-professional public appearance for businesses in them, most likely a cute young girl.
Minimum wage laws, increasing Social Security and other withholding/employer-contribution taxes, and the Fair Labor Standards Act pretty much killed off any kind of low-level jobs like that and any of those nice wood-paneled elevators would have been replaced by semi-modern stainless-steel/pastel-green-or-brown self-service push-buton elevators in the 60s.