No offence, but you're at fault then. You have the option to autolock and that isn't good enough (because swiping that switch is so much effort...) and not autolocking isn't good enough but the screen times out. There's a simple solution, and it's what i do myself: when you pick the phone up to put in your pocket, hit the power button or tap the screen. That will let you know if it's locked or unlocked.