Sneak round the back and try to get though the back door

You start to sneak around to the back of the shops. You crouch from cover to cover trying to stay out of sight from the zombies lurching around. You get to a wall on the side of the shops. There are no zombies so far but you still want to be careful. You peak around the corner of the building and spot a zombie standing near the door you need to get to. He's around 20 years old, 6'2" with no clothes on, short brown hair and blue eyes. You swear a curse under your breath and try to stay calm thinking of what to do next.