To unlock this type of window from the outside: Find out if the window is open and push it with your hands. If this doesn't work, place a prybar between the window and the windowsill. Jiggle the window a little, and it will move and be able to slide or come off.
Place the head of a putty knife in the lower section of the crevice between the sash and frame on the opposite side of the hinges. Bend the handle of the putty knife to gently pry it open. Continue this motion up to the top of the window, and repeat it along the top and bottom edges.
Using a flat screwdriver, grip the seal around the window frame and pull it out around the area of the window lock or push the seal down and out of its groove. Now the seal has been removed, use a torch to see into the now empty groove and insert a small allen key into the gap between the frame and sash.
If the sliding window lock uses a lever, you turn the lever to lock and unlock the window. If it uses a thumbscrew, you have to twist a wing nut to secure the lock and prevent the window from opening. Some sliding window locks even use keys.
Find the place where the door or window locks. Clean the line of knife and try to open the latch by passing the latch inside. Slide the knife between the door and the frame of the door. Slide until you touch the bolt.
Burglars can open a window in many different ways. Often they use a crowbar to force open a poorly secured window or take off the beadings to remove the windowpane from the frame. Sometimes intruders simply break the window with a hammer or an automatic center punch.
Stay silent
Get your phone and call the police. If you have a panic button, use it, as silently as possible. "If you live with a flat mate, try to alert the other person silently. If you can't call the police, text someone like your complex security or someone who you know you can rely on.