The ornamental design for a shoe last, as shown and described.
FIG. 1 is a left side elevation view of my new design for a shoe last, the top connection piece being shown in dotted lines which is for illustrative purposes only and does not form part of the claimed design.
FIG. 2 is a right side elevation view of FIG. 1.
FIG. 3 is a bottom side plan view of FIG. 1.
FIG. 4 is a right side elevation view of FIG. 1.
FIG. 5 is a front side elevation view of FIG. 1; and,
FIG. 6 is a back side elevation view a top side plan view of FIG. 1.