How to distinguish between "left-opening" and "right-opening" doors in Feng Shui?

The left inner door door means that people do not need to use a key to open the door indoors. The door lock is on the left side of the door. Pull the door toward the indoor direction. When people open the door with a key outdoors, the door lock is on the left side of the door. Push the door in the direction of the city. If you open the door on the right side, you are indoors and do not need to use a key to open the door. The lock is on the left side of the door and the door is opened in the direction of the city. If you are outside, you use the key to open the door. The door is locked on the left side of the door and opens the door in the city direction. Push the door open.