A device for preventing unauthorized opening of a door comprises a bracket, a main handle, and a wedge. The bracket is adapted for mounting the device to a door. The main handle is pivotably attached to the bracket. The main handle has a pivot end attached to the bracket and an opposing grasping end. The main handle is selectively pivotably movable upward and downward. The main handle is adapted such that pivoting the main handle upward moves the grasping end toward the door and pivoting the main handle downward moves the grasping end away from the door. The wedge is pivotably affixed to the main handle and biased toward the door when the main handle is in a downward position. The main handle is adapted to push a distal end of the wedge at least partly under a bottom surface of the door when the main handle is pivoted downward.