@Sometimesfraught82 obviously the usual actual library related jobs like shelving, signing up new members, helping someone find 'the book with the blue cover, not sure of the name but surely you know what it is from that description' books', processing new stock and reservations on the system etc. Also cashing up etc.
Booking people onto the computers, helping people use them for stuff like housing applications, job centre stuff etc- for those who don't know how to use a computer you could easily be sat with someone for an hour whilst keeping an eye on everyone else on the computers and trying to help them when needed.
Daily rhyme time/outreach activities, including the summer reading challenge obviously during the summer. Preparing the children's area for school visits, helping the librarian to arrange said visits. Setting up for and running adult literacy groups, teen reading groups, book clubs, health initiative information sessions, and anything else they want you to do.
Answering queries from the switchboard about general council services, and helping people who with printing his timetables etc- basically an information point as everywhere else in town council related had closed.
Speaking to vulnerable people who are often lonely, and don't know where to turn, this can range from having a chat to working with other areas to identify how they can access the support they need.
It wasn't necessarily hard work, but be rare to not be constantly busy in some way. I loved it, but its mostly volunteers here now, with just one or two paid members of staff to handle cash and process peoples data when they join which volunteers aren't permitted to do.