The door is locked - Mission Failed

He twisted on the doorknob only to find out it's locked. By now he suddenly remembers that Jen always locks her room no matter what. It was always the first thing on her mind when she leaves her room. And it's starting to peek his interest more and more. The last time he was in her room was during the first 2 weeks after they moved in. They've only moved into this house for a year and he still remembers there were spare keys somewhere downstairs. It was just a few days ago when he noticed a bunch of keys from the same type in her bag. That must be it, but how can he get them?