Can an apikores kasher a sink

I accidentally mixed up the milk and meat sinks in my apartment. I rinsed out a yogurt tin in the meat sink. I keep a 100% kosher kitchen in case my yeshivish family or friends come to visit, but I am an atheist. Would it be sufficient if I kasher the sink, or do I need to find a frum person to do it?

I can’t ask a rabbi about this at the current time.