When I was writing my personal statement, my teacher always advised me to try to find links between my chosen subjects to different areas of my life. She told me that it doesn't have to be all about your academic background, but rather your choices and the reasons for why you do those certain things.
Does your work link to sociology? Even if it may not seem like it, I'm sure you will find small links because sociology is the study of social behaviour and society - the world we live in. Even if your field of work does not directly seem "sociology-related," perhaps you can talk about what working in such an environment made you think or feel. Or how much it made you realise that you have this passion to learn more about it.
Hoped that helped and I'm sorry if it didn't! My best advice would be to really think about why you chose sociology out of all the subjects and courses in the world. Make the universities believe and see what sociology means to you, and make them how there is no other subject you would rather devote your time to. Don't just write things like, "I've always been passionate about it ever since I was young," or something generic like that. Stand out by showing how much you love sociology.
Good luck!