YOUNGSTOWN — A clerk at Adult Toy & Gift on Market Street hit a panic button and used pepper spray on a robber who said he had a knife, police reports show. The man, who also robbed the store twice last month, came toward the register Sunday afternoon as the clerk continued to aim the pepper spray toward his face. He failed to open the register but did find $150 and took it, police said. He ran out the door to an older white station wagon. A copy of the store’s surveillance video was to be turned over to detectives.