Sorting entire sheet data based on 2 columns of information

Hey everyone, I make big sheets for monthly insurance renewals that I format then lock, where the only option for an editor is to add completion date and tick that it’s done. I’m trying to add a filter where they can click it and the sheet sorts to ‘completion date’ in order, then click it again to go back to ‘serial’ (original order). I don’t want them to be able to sort anything else on the sheet. Is there any easy way to do this?