Weight: 1 lb.
Estimated Value (Sane Cost Guide): 50 gp
DMG Value: 50 gp - 100 gp
This lock appears to be an ordinary lock and comes with a single key. The tumblers in this lock magically adjust to thwart burglars. Dexterity checks made to pick the lock have disadvantage. Locks have a base DC of 15. Poor quality locks can have lower DCs, and high quality locks can have higher DCs (DMs discretion). The lock quality can also affect the price.
Source: Xanathar's Guide to Everything p138