There should be some form of secondary lock to block someone from entering at EVERY property. If not, do have a discussion with the MOD and post your experience on here and maybe even TripAdvisor to let others know their safety is not taken seriously by the property. I have seen some doors where you merely lift up on the handle to engage a security bolt. I do expect the property to have a means to override such locks, but those keys/tools should NOT be in the hands of regular daily housekeepers. If you find that to be the case, again, have a talk with the MOD to let them know that is not acceptable and alert others. I do agree a property should have the ability to periodically inspect rooms for a welfare check or nefarious activity, but that needs to be done by security staff or management.