Will working after bachelors reduce my chances of getting into a PhD program?
When I started my PhD the majority of my fellow students had spent time working before they started. Some of them had been in full time employment for years (I believe the most was 7 years). As someone who went straight from BSc to PhD I was definitely the exception and not the rule. It shouldn't be something to worry about.

My supervisor's take on the subject of how he chose candidates was: "Whoever seems right at the interview."

From my experience of interviews having relevant experience and showing a good work ethic is as important in academia as working for any other employer. Working outside of academia for a spell is no limitation and can in some case be a boon.

Passion for the subject area and proof of regular hard work will get you a very long way with most academics.