The ornamental design for a door handle, as shown and described.
FIG. 1 is a perspective view of a door handle in accordance with the present invention;
FIG. 2 is a front view of the door handle of FIG. 1;
FIG. 3 is a first side view of the door handle of FIGS. 1 and 2;
FIG. 4 is a second opposite side view of the door handle of FIGS. 1-3;
FIG. 5 is a rear view of the door handle of FIGS. 1-4;
FIG. 6 is a top view of the door handle of FIGS. 1-5; and,
FIG. 7 is a bottom view of the door handle of FIGS. 1-6.
The broken lines are directed to environmental structure and unclaimed subject matter, and are for illustrative purposes only; the broken lines form no part of the claimed design.