Most locks are trivially defeatable and easy to force. Heck, there's often a large window right beside a suburban door. Break the glass, open the door. Locks are only there to deter crimes of opportunity and make it more likely you'll actually notice a theft in a timely fashion.
And Microsoft didn't even bother to do that much. Spyware was able to embed itself in any windows installation for a solid decade, just by visiting a website. removing it required at least 30m of updating and installing specialized tools and was well out of reach of the average user.