A Shake Shack employee turned his own workplace into the scene of an armed robbery, only to make the bizarre decision to return for his next shift two days later. Keondre Simmons, 33, was arrested on 5 August after detectives watched him leave his home and drive to the Shake Shack near Scottsdale and Greenway roads in Arizona, where he was reportedly wearing his work uniform. Police say the arrest came after investigators linked him to a 3 Augus…