Vuetify: 3.1.4: v-data-table-virtual: How to reset sorting

[gvg356]

I have a table with 4 columns and all columns can be sorted. First column is default sorted using sort-by prop. When user clicks on another column to sort and clicks on "Reset Sort" button the first column should be sorted.
How to reset sort to the default sort by clicking a button?
<v-data-table-virtual id="results" :items="getResults" :height="400" item-value="key" :headers="headers" :sort-by="defaultSort" >
<--script--->
const defaultSort = [ { key: "key1", order: "asc", }, ];