Screen turned off but didn't lock

I'm using a Samsung Galaxy Note 5. After i upgraded to Nougat, sometimes after i used the phone, i didn't lock it. (screen timeout have been set to 1 minute) In 15 minutes later, i want to unlock my phone. However, it's unlocked already. I didn't put my fingerprint yet. I need to lock my phone manually. It's really annoying when i forget to lock my phone. Can anyone help me?

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