Police arrested a Somerville man on Tuesday after he allegedly broke into the locked garage of a downtown police station. Around 2:30 a.m., officers observed Michael Naughton, 24, break through a locked door and enter the garage of the 40 Sudbury St. station, Boston police said. When the officers confronted Naughton, he allegedly yelled at them to get out of his house, police said. After the officers handcuffed Naughton, he allegedly became belligerent and “struggled erratically, pulling his arms away from the officers, tightly clenching his fists and arms, and tensing his entire body,” a police statement said.Todd Feathers can be reached at firstname.lastname@example.org. Follow him on Twitter @ToddFeathers.