Expectation: While pressing tab, select should open with options.. It is not working. I tried after adding data-mdb-auto-select=true. still not working

Actual: Select is not opening or showing on tab press

<select class="select" data-mdb-auto-select=true>
<option>Select2</option>
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>                                                                                      
<option value="4">Four</option>
<option value="5">Five</option>
</select>
<label class="form-label select-label">Example label</label>