Police investigate two area robberiesAn Oakland man was arrested after an aimed robbery of a Hayward grocery store yesterday, and a San Lorenzo liquor store and a San Leandro photographer were held up at gunpoint Saturday.In Hayward, police arrested Claudius H. Johnson, 21, of Oakland after a man simulating having a gun robbed the 7-11 store at m Orchard Avc about 11:15 p.m. yesterday, traveling down Orchard without lights.Shortly after the robbery, police stopped Johnson's car while it was traveling without Lights down Orchard near O’Neil Avenue. •A Son Lorenzo liquor store was robbed at gunpoint of $57 late Saturday by a man in his 20s with a “very noticeable scar” on his face, according to the sheriff's department.Deputies said the man, who had an almost inch-long scar under his left eye, entered -Sheridan Liquors, 275 E. Leweliing Blvd., about midnight with a scarf pulled over his lower face.He approached the counter in front of the cash register, deputies said, pulled a gun, and warned the clerk and two witnesses not to *'do anything foolish.Two armed men held up photographer Andy Galvan, 62, as he parked his car in front of his San Leandro home Saturday night.One of the men rapped on the car window with a gun as Galvan pulled into his parking place, then shoved the weapon into his victim s chest when Galvan lowered the window*.GaJvan dropped his wallet as he exited the ' car on the passenger side to hide it from the robbers' sight, but the second man retrieved it.They fled with the wallet containing $45.