Tenant locked me out of duplex, is this legal?

I live on the thirf floor, he lives on the second floor on the right side of the duplex apartment. Me and him argue all the time, today i was going to the store, we had a screamfest before i left he LOCKED ME OUT and told me if i wanted to come back in my apartment i'd have to use the left side and he called... show more I live on the thirf floor, he lives on the second floor on the right side of the duplex apartment. Me and him argue all the time, today i was going to the store, we had a screamfest before i left he LOCKED ME OUT and told me if i wanted to come back in my apartment i'd have to use the left side and he called me a scumbag. He is not the landlord is this legal ?
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