Symbol 0638 from ISO 7000 - Title/Meaning: Door-lock control Function/description: To indicate the control that locks each door prohibiting ingress and egress. To indicate the operational status of the door lock.
Additional information: 
On road vehicles: symbol allows for mirror image.
Own work using: iso.org/obp/graphics/grs/81ce6c4b-1431-4ce3-8119-bc13b76409b5 200.png
Vectorization:  Mrmw