A man accused of threatening store employees and customers and then being unruly toward officers was arrested today at the Safeway on Northeast Stephens Street, police said. Nathan Earl Johnson, 38, a transient, was booked into the Douglas County Jail on suspicion of second-degree criminal trespassing, second-degree disorderly conduct and resisting arrest. He was in custody today in lieu of $10,000 bail. Johnston is suspected of refusing to leave the store when ordered to by store employees at about 12:45 a.m. When contacted by officers, Johnston became violent, police said. He resisted arrest and had to be forced to the …