I'm am already an experienced holistic practitioner and have studied many different holistic therapies for over 14 years.
I also have been looking into what is involved in becoming a reflexologist because it would be a good compliment to my other services. According to everything I have found, its a very involved process. It starts with a few days worth of theory training, followed by practical training. Then a written exam and practical testing occurs.
After that, I believe you need to provide and document 60 practical sessions - which are submitted for review by the association. Once that is complete and passed, you will need to complete a final exam before being licensed as a reflexologist by the government.
Everything I have researched says you have 1 year to complete the process and pass or your training expires and you need to reapply.
If you have found a class this is one evening only and free, then I would suspect its only an introductory class designed to give you an idea what reflexology is all about. Probably its being run by a reflexologist who is trying to educate the community and build up his/her client base.
If its something you are interested in, then I would say go for it and check it out. It won't harm anything, and you might pick up some simple techniques you can practise on yourself. if this is something you want to pursue as a job, you need to research the state/provincial associations to find out what is required in your area.
I included links for more detailed info on qualification requirements.
I hope that helps.