The ornamental design for a door handle, as shown and described.
The file of this patent contains at least one drawing/photograph executed in color. Copies of this patent with color drawing(s)/photograph(s) will be provided by the Office upon request and payment of the necessary fee.
1.0 is a front view of a door handle.
The red colored shading shown in the drawing illustrates portions of the door handle that form no part of the claimed design.