my position was eliminated and I was offered another position at approx. the same pay, but this job is a physical job that I haven't done in over 20 years and have never done for this company, if I refuse this position, and they have nothing else comparab

I left my last job of 29 years to help my new company rebuild a portion of a failing service dept. in a commercial truck dealership, 4 months in they wanted me to take on more responsibility due to my experience,
and I accepted and was compensated accordingly, now a year later they eliminated my position but offered me a job with like pay as a working service tech. I physically do not think I can work on semi's at 52 years old with a bad back. there is a possibility of another administrative job but at a lower pay grade, my concern is that if I don't take the working tech job would I qualify for unemployment. I do not want to quit the company, but I think since I have not worked as a service tech in over 20 years, I will not be able to perform the job properly.