It's tough to say the least. I had 10 years of retail experience, but I shifted over to a lower-paying administrative/HR position with a fixed schedule in my last job as soon as it opened up, went back to school nights for 2 years to get an AAS in Computer Networking (Cisco Systems) to add to my BS in Business, and leveraged all of that to get an IT job at the corporate office of the store I was working in.
The problem with retail management is it's not a skill, and certainly not a marketable one outside the field of retail. Your skill is your tolerance for the long hours, customers disrespecting you, and trying to motivate underpaid associates to do even the basics of what is expected of them.
You need to go back to school and get a SKILL. Something that requires specialized training, certification, or some sort of barrier to entry. Nursing would be a good one. 2 years in school and you can sell your years of customer experience as bedside manner.
But you need to face facts, you're 20 plus years in and selling your operations management experience to get an administrative job with no MS Office Suite experience is a tough sell. Even if you are 40+, it's never too late to reinvent yourself. But there is no quick fix. Retail is quick sand. Once you're in, it's not easy to get out and it's going to take a little effort on your part. Good luck to you.