Husband “accidentally” locked me on balcony

I was showing our daughter the first snow on the balcony when my husband approached to check too and while i was distracted he closed the door and went the other room. I didn't heard when that happened even though the door was right behind my back. It was cold and we were in pajamas. I started knocking loudly on the glass and it took him a minute to come, with a distance of one small room, he came slowly walking looking pretty calm and smiling at me, opened the door and asked if we were feeling cold out there.. i was in fear and confused of how calm he was. Seemed like he was just making sure we were cold. I asked him why didn't he came the first time I knocked and he said he did..which wasn't true. he was using one earbud for music also, and he said that i had luck that he didn't use both headphones.. then he said just sorry, because I kept telling him that it was a bad joke. He locked a glass door while he was literally watching my back on the balcony as he said "by habbit, just accidentally " without making any noise while doing it... Am I overthinking/over reacting it or it was on purpose ?? Never ever happened before, also he has narcissistic behaviour