Except the FBI probably won't make that mistake again. They'll wake up a judge and expedite the process,
citing this exact case as to why they need to be granted the subpoena. from there it's not that hard to make a jig that constantly does some sort of action so the phone never goes to sleep.
From your https://www.forbes.com/sites/thomasbrewster/2018/03/22/yes-c...