To lock without using the keyTo lock without using the key  - Doors - Locking and unlocking - Mitsubishi Lancer Owner's Manual - Mitsubishi Lancer

Set the inside lock knob (1) to the locked position, and close the door (2).

Set the inside lock knob (1) to the locked position, and close the door (2).

► The driver’s door cannot be locked using the inside lock knob while the driver’s Note

► The driver’s door cannot be locked using the inside lock knob while the driver’s door is opened.

    See also:

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    Setting of door and rear hatch unlock function (vehicles equipped with the central door lock switch)
    The door and rear hatch unlock function can be set to the following two conditions. Each time the door and rear hatch unlock function is set, a chime will sound to tell you the condition of the doo ...