Useless 'OPEN/CLOSE' Magic? I Just LOCKED the Archmage's Core

He was once an earthly legendary locksmith, but his stage four brain cancer made his death inevitable. He wishes to have a good life in his next. However, he wakes up as Silvester Lerwick with an Open and Close skill and nothing else. He was just a six-year-old child. Lerwicks are the house of the strongest fire mages in the Kingdom of Novaria, and he does not inherit any of that. His family disowned him for being “useless” and exiled him secretly for their own good. He spent years conquering the dungeon and obtaining the skills that he loved. He entered a magic academy and disguised himself as a fragile support scholar without his family background. He wants his freedom from the Lerwicks and to make his wish come true to finally live his life to the fullest. Silvester, a master locksmith in his past life, saw the fundamental blueprint of reality. To him, physical plate armor, defensive wards, and high-tier offensive spells are just sets of pin-tumbler locks waiting to be picked. Will he ever help this cruel world when an ancient evil emerges?