Lock capable of automatically locking a door after closing

A lock comprising:

• a case body;
• a latch movably coupled to the case body and movable between a latching position and an unlatching position;
• a connecting member pivotably connected to the case body, wherein the connecting member includes a push end operatively connected to the latch, wherein pivotal movement of the connecting member actuates the latch to move from the latching position to the unlatching position;
• an anti-theft latch movably coupled to the case body and movable between an anti-theft position and a non-anti-theft position;
• a stop rod pivotably connected to the case body, wherein movement of the anti-theft latch causes pivotal movement of the stop rod, and wherein when the stop rod is not pivotable, the anti-theft latch is prevented from moving from the non-anti-theft position to the anti-theft position;
• a stop-latch movably coupled to the case body, wherein the stop-latch is movable between an extended position and a retracted position, wherein when the stop-latch is in the extended position, pivotal movement of the stop rod is prevented, and wherein when the stop-latch is in the retracted position, the stop rod is pivotable, and the anti-theft latch is movable from the non-anti-theft position to the anti-theft position;
• an anti-theft control member pivotably connected to the case body, wherein the anti-theft control member includes a first push end operatively connected to the anti-theft latch and an arm spaced from the first push end;
• a locking spring including an end coupled to the case body and another end coupled to the arm, wherein when the stop-latch is in the retracted position, the locking spring pivots the anti-theft control member and actuates anti-theft latch to move from the non-anti-theft position to the anti-theft position, and wherein when the stop-latch is in the extended position, the anti-theft latch is prevented from moving from the non-anti-theft position to the anti-theft position, and the locking spring is incapable of pivoting the anti-theft control member;
• an unlatching rod pivotably connected to the case body, wherein the unlatching rod includes a first push portion and a second push portion spaced from the first push portion, wherein the second push portion is operatively connected to the latch, wherein when the unlatching rod pivots, the latch moves from the latching position to the unlatching position, and wherein the anti-theft control member further includes a second push end spaced from the first push end;
• and
• a locking operation device mounted to the case body, wherein the locking operation device includes a pivotable push block, wherein with the anti-theft latch in the anti-theft position and with the latch in the latching position, rotation of the push block firstly presses against the second push end to pivot the anti-theft control member and to actuate the anti-theft latch to move from the anti-theft position to the non-anti-theft position, and then the push block presses against the first push portion to pivot the unlatching rod to thereby move the latch toward the unlatching position.