They explored the first floor for something interesting and if nothing comes up Clary fiddles with the lock while the others keep a look out. Clary uses her Stele and the only rune she knows from her canon point in the books with is the rune for OPEN. Details on rune's here.

If her runes don't work Bruce or Scott will be breaking locks. Clary's doesn't leave a trace behind so she wants to try that first.