Banks figured this out long ago when they started installing ATM machines. ATM’s are now to the point where tellers will become obsolete very quickly.
I go to Union bank on Coast HWY in Oceanside CA. They used to have 3 windows open and an operations manager supervising tellers and a manager. Now they have 1 window open and if there’s a kine the manager opens a window. no operations manager down two tellers.