Get smart. “First of all, use the door locks that you already have,” advises Sgt. Dan Ryan, of the Palo Alto, Calif., Police Department. People in friendly communities that are generally safe may think they don’t need to lock their doors. That’s a big mistake, Ryan says. Here are more strategies: • Make it a nightly routine to check the locks. Involve children, too, says Chris McGoey, a security exper...

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