a humanized convenient door lock includes a lock housing , a latch , a security hook , an outside handle operation mechanism , an inside handle operation mechanism , a cylinder driving mechanism , and an inside deadlocking rotary knob driving mechanism . the inside handle operation mechanism drives and controls the latch , the security hook , and the inside deadlocking rotary knob driving mechanism . to open the door , it only needs a one - time operation by pressing down a handle , thereby providing ease and convenience . the design is a humanized one , making it particularly suit for the needs of the disabled and the elderly and for urgent door opening .