Looking for a timer app that you have to unlock the phone to turn off the timer.

So I use my phone timer almost constantly throughout the day. I just use the stock Google clock which has for the most part has been more than sufficient. However, lately as in the last few months I've noticed I accidentally hit the stop button as it's going off in my pocket. Which causes me to miss my alarm. It'd solve all my problems if I could just set it so that I'd need to unlock my phone to turn it off, but as far as I can tell that isn't an option.