The phrase "locks on" can have a variety of synonyms depending on context. In terms of physical locks, synonyms include "secures," "fastens," "clips," "bolts," and "latches." In terms of computer or technology security, synonyms may include "encrypts," "safeguards," "protects," "shields," and "firewalls." In more figurative language, "locks on" can be replaced with "focuses on," "concentrates on," "zones in on," or "fixates on." The right synonym depends on the situation and the tone desired, as each will convey slightly different connotations.