Door threshold
FIG. 1 is a perspective view of a door threshold showing our new design, the door threshold is broken in the center to show indeterminate length; 
     FIG. 2 is a right side elevational view thereof, the left side being a mirror image thereto, the broken lines showing the lower portion of a door is for illustrative purposes only and form no part of the claimed design; 
     FIG. 3 is a front elevational view thereof; 
     FIG. 4 is a rear elevational view thereof; 
     FIG. 5 is a top plan view thereof; and, 
     FIG. 6 is a bottom plan view thereof.