16 Lockers. One Key. How Few Questions Can Find It?

What is the fewest yes-or-no questions that can always locate the key? THE RULES Exactly one of sixteen lockers contains the key. Each question may ask whether it is in any chosen set of lockers. Every answer is truthful; you must always identify the locker. You have 12 seconds before the explanation. Pause if you want more thinking time. Did you solve it before the last tick? Share your answer and reasoning in the comments. Subscribe to Last Tick Logic for more puzzle challenges. #LogicPuzzle #BrainTeaser #Deduction