![Amazon.com: Notice This Door Must Be Kept Locked at All Times Decal. 9X12. 5 Pack (5-Decals) Industrial Grade. Business Security Decals. : Industrial & Scientific Amazon.com: Notice This Door Must Be Kept Locked at All Times Decal. 9X12. 5 Pack (5-Decals) Industrial Grade. Business Security Decals. : Industrial & Scientific](https://m.media-amazon.com/images/I/81z+lhHoRkL.jpg)
Amazon.com: Notice This Door Must Be Kept Locked at All Times Decal. 9X12. 5 Pack (5-Decals) Industrial Grade. Business Security Decals. : Industrial & Scientific
A door is locked and impenetrable, and Neil doesn't have a key. No one unlocks the door for him, and no damage is done, yet he is able to open the door
![This door is locked please use the other door safety sign - Self adhesive sticker (200mm x 150mm) : Amazon.co.uk: DIY & Tools This door is locked please use the other door safety sign - Self adhesive sticker (200mm x 150mm) : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/I/51lkvQC1XfL.jpg)