The ornamental design for a shoehorn, as shown and described.
FIG. 1 is a front perspective view of a shoe horn showing my new design,
the blade or spoon of which is being shown as discontinuous in order to
indicate interminate length;
FIG. 2 is a rear perspective view;
FIG. 3 is a front perspective view of a shoe horn showing a second
embodiment which includes a key chain;