There is always data entry! ...Which can turn your brain to oatmeal after a while, but it's a not terribly demanding computer-based job that doesn't require much interaction with customers beyond an occasional email or call to ask for clarifications about glitches in the files/forms you're trying to enter into databases. And some jobs of that nature then also involve some minor manipulation/organization of the data being entered, so they're not quite as brain-killing.

I've done much more receptionist work than secretarial work, which you probably wouldn't like because receptionists are always dealing with people, whereas secretarial work can be people-heavy or people-light, depending on the nature of the office one works in. But when I was (briefly) a secretary at a maintenance department of a larger organization, what I did was receive, sort, and send faxes; answer phones and either route calls/take messages; create work orders, assign them to the appropriate maintenance specialists, and file them once they were completed; and some general office tidying and such-like. Basically a secretary (or administrative assistant) is there to take care of the routine business of their office so their boss can deal with the bigger issues, and also to run a little interference between their boss and people who come by and want to set up meetings.