Lock for a motor vehicle

A lock for a door leaf of motor vehicle comprising:

• an opening lever of said door leaf that allows the opening of the door leaf;
• a blocking means configured to take an active blocking position in which said blocking means blocks said opening lever and a rest position in which said blocking means allows the movement of said opening lever;
• a blocking elastic return means configured to switch said blocking means from the rest position to the active blocking position;
• and
• a trigger means configured to take a rest position in which said trigger means blocks the blocking means in its rest position and an active blocking position in which said trigger releases said blocking means so that the blocking means passes from the rest position to the active blocking position, the trigger means being arranged to move under the effect of an inertial force applied to the lock during an accident,
• the opening lever comprising a driving means configured to bring the blocking means from the active blocking position to the rest position when the opening lever is pivoted towards the direction of the opening of the door leaf,
• wherein the blocking means includes at least one elastic arm configured to change the length of the blocking means in order to disengage the blocking elastic return means of the blocking means.