@blossom & @juillet are right on the money.
Is a PhD the most useful credential for the work you want to do? Is “Sociology” the field?
Have you looked at the goals of any PhD programs? a big part of the PhD application process is the fit between your goals and their program. Check out the research areas that programs and staff are currently interested in.
Don’t start a PhD unless you have a really clear reason for doing one and know that you like research!
fwiw, like you I worked between UG & MA and MA & PhD. I found it very do-able, but one of the reasons was that I knew exactly what I wanted from each degree.