Yeah, definitely contact your professors and make sure they remember you, at the very least! Beyond your GRE score (which should hopefully convince the admissions committee that you're prepped -- even if the physics gre is a poorly designed, and imo pointless, exam) and gpa, your letters and experience will determine your chances at getting into a decent program.
You should consider joining a research lab/program (if that's possible given your current circumstances) pursuing topics in which you are interested. This will give you some recent experience you can discuss in your application, a possible recent rec. letter, and also something that'll make you a stronger applicant next year, should you not get into the program of your choice this coming year. It will also confirm for you that you really want to do this since with time one tends to romanticize college
(it's happened to me in the span of a year after college...)
I worked in an industry unrelated to physics for a year, but I also applied to grad school that year so it wasn't a huge gap. Another option to consider is do a master's in physics at a school that offers a terminal master's program -- especially if you have the financial resources to support this. An attractive option related to this is to do your Master's in the UK where it is more common, and a raft of scholarships exist that could support you with this. You'd be a super-strong applicant to any ph.d. program with that in your application!
Congratulations on making the first step to deciding this might be the path to you -- for most people, leaving a comfortable job in ndustry is unthinkable.. I've certainly gotten my share of surprised looks. Best of luck!