If you're talking about working in a public library, here are the types of jobs you would be qualified for, and some clarification on job titles:
Shelver/page: put books in order, put books back on the shelves. Salary: slightly above minimum wage, and generally part time. These positions usually require a high school diploma/current enrollment in school. Your main competition would be high school/college students and retirees.
Circulation clerk/ circulation assistant/library assistant: check books out, check in returned books, process books, answer basic questions, deal with angry customers.
wages vary, but between $9-14/hr is pretty typical, depending on the amount of responsibility in the individual position, and the variety of tasks you are responsible for. At most libraries, this position asks for a high school diploma, some college preferred.
Library technician: this one is more difficult, because different libraries use it to mean different things. Generally, this is a position on a level similar to a circulation assistant, but you may be asked to do some duties of an associate librarian as well. Often, a technician will have more of a back office role, less customer interaction, but that's not a hard and fast rule. Read the job description to see which one it is.
Library associate/associate librarian/assistant librarian: answer research questions, provide research instruction, recommend books, create library programs. Some libraries still pay peanuts for this position, but in larger library systems (in cities or major metro areas) you can earn a decent wage. Expect a salary of $20-50k/yr. many of these positions are full time, though some part time is available.
I started out as an associate librarian, and it was a great way to get a feel for what being a librarian is like. Unfortunately, nowadays most associate positions go to grads with an MLS. If you are applying for any full time position in a library, you can be sure that some of your competition will have an MLS. It's not impossible to obtain one, but you really ned to know how to sell yourself and your experience for the position. However, if a part time position would work for you, those are a little bit easier to obtain.
Sorry I couldn't offer more optimistic news, but I hope this was helpful.