I was in the only line and next up for checking out. I noticed a register to my left was coming open , so I pushed my heavy laden cart over. The male checker curtly told me they had only line and I had to go over and get in it. I told him I had just come from that line. He firmly held his ground, so I returned my heavy items to their place and left. I glanced about, but didn’t see any signage about forming one line. I appreciate stores who use that system. What angered me was his rudeness during the incident and being humiliated in front of other customers. The upside is I didn’t spend $225+ for merchandise I had already selected.