Previous character managed to have a minimum roll of 29 on sleight of hand by the end of the campaign. Needless to say the DM never bothered with locked doors
When the Assasin Rouge reaches level 9, gets Uncanny Dodge, is a High-Elf which gives them a Dex modifier boost, has Boots of Elvenkind and a Cloak of Elvenkind, and specializes in Dexterity leading to 17(+3) Dex, and +11 to stealth: