Do you lock your doors during the day when you are home?

This question has been asked before a few years ago, and now my answer is very different. Back a few years ago, my answer was no, I feel very safe. Now, I lock my doors at all times. Nothing has really changed in my neighborhood so I’m not sure if it’s because I’m older and wiser, or just more aware what could happen.
What are your reasons for locking or not locking?