Who’s forfeiting anything? If you don’t want to unlock your device for law enforcement, just use the sleep/lock button to make your phone require the passcode (which the police can’t legally compel you to give, I believe). It takes several seconds to key in a reasonably secure passcode, and it ceases to be secure if you type it in view of any security cameras. Also, if you open your phone 50 times per day, it’s way more than just a few seconds.