Edit History

First one needs to be:

xpath="/progression/perks/perk[@name='perkLockPicking']/effect_group/passive_effect[@name='LockPickTime']/@value">

• The entire path has to be between two ".  You had an extra one after perkLockPicking]
• The code is structured in layers, you missed a sublayer between progression and perk (perks)
  • Recommend getting a good xml editing program that shows the layers of code, I use Notepad++ myself
  • One way to avoid these types of error is just to do this

xpath="//perk[@name='perkLockPicking']/effect_group/passive_effect[@name='LockPickTime']/@value">

• You need the @ symbol with name.  That tells the game to find passive_effect with Name = LockPickTime and the specific perk

Second one has several issues, but it would add it to the items.xml file at the bottom:

• In the item name, do not use spaces.  It needs to be continuous to avoid any issues.
  • If you want to have spaces in the name when you view it in game, you need to add it to the localization file which allows spaces
• You have </effect_group> closed out but have no starting effect group in the code.