Housekeeping came early one time and caught the door locked. I happened to be just waking up and heard the faintest knock you can imagine. Three love taps on the door then a pause of 3 or 4 seconds before the electric lock opened. Then ... nothing. She couldn't get in. I don't know what she did after that. I got up. Began my morning routine. Put a shirt on. then pulled the addalock off the door and peeked out. Mousekeeping cart was down the hall a bit. Maybe she called her boss, but no one seemed to be in a hurry. Compared to my last trip, where the door swung open and slammed the privacy lock while I was asleep, I'm counting it as a win.
It takes about 3 seconds to defeat the swaybar and ... ironically ... the most common technique uses the do-not-disturb sign to flip the latch over.
I don't actually have a problem with the policy on principle but the way they are implementing it is not at all how they are describing it. They make it seem like hotel staff sees a room-occupied placard and knocks, gets an answer, or knocks again a few more times before deciding the guest forgot to remove their placard and letting themselves in. That would be okay I guess. But that's not what's happening. Even before this 'security check' business, a mousekeeper that would wait more than a few seconds for you to answer a knock before opening your room was rare in my experience.
Whenever someone takes money in exchange for a room to live in, be it a yearly lease down to a daily hotel, there is something called an "Implied Covenant of Quiet Enjoyment". Even in Florida this is a legal right that cannot be signed away in the rental agreement. Among this covenant are the right to Privacy and Peace & Quiet: Including the freedom from unreasonable and recurring disturbances from the landlord and/or other neighbors. This usually is held to mean that the property owner can stipulate access to your room but must do so in a way that minimizes disruption to the renter's peace and quiet.
Custodial staff letting themselves into occupied rooms is not something I have to accept. Or maybe I go back to sleeping in the buff.