How to apply sorting in Material table with conditional checkboxes

How to apply sorting in Material table with conditional checkboxes:

<ng-container matColumnDef="key">
                            <mat-header-cell *matHeaderCellDef mat-sort-header> Key  </mat-header-cell> 
                            <mat-cell *matCellDef="let element">   </mat-cell> 
                        </ng-container>