This mod script does just what the title says, it allows you to rob the Vangelico Jewellery Store like in the mission. I have remade the script and removed a lot of redundant code making the script run faster.

Requirements:
Open All Interiors Mod - https://www.gta5-mods.com/scripts/open-all-interiors

Latest Script Hook - http://www.dev-c.com/gtav/scripthookv/

Headscript's LUA plugin - https://github.com/gallexme/LuaPlugin-GTAV/archive/master.zip.

Changelog:
0.1v
Initial release
0.2v
Added guards
0.3v
Bugfix
0.4v
Better looting system
0.5v
No button mashing

Credits:
haws1290
Kolinsasa for video

Steps:

1. Start heist with E (A prompt will tell you when to press E)
2. Loot as much as you want by hitting E at a jewellery cases.
3. Leave and evade the cops still you lose your wanted level.
4. Drop the jewellery off at Lester's place so he can sell it on.

Installation:
VangelicoHeistV2.lua and VangelicoGuards in the GTAV Directory/scripts/addins folder