I'm 16 and my coworker is 20. We barely talk since we work in two different areas but I have to past into his station every now and then to drop something off. Today at work I passed by him but when I went to go back to my station he put his arm out and stopped me and told me I couldn't pass. I said why and tried pushing though. He said I'm not letting you sneak past me again after laughing. After a few minutes I gave up and tried slipping under his arm. I almost made it but then he reached around and grabbed my waist. He laughed and held on for minute before letting go. Is he just messing around or is he not? If he's not then what should I do, it made me very uncomfortable