Don't know what to do?

So basically I'm trying to make a sliding door that when you touch it it decreases .1 studs every .1 second, or even smoother.

local a = game.Workspace.DoorEntrance.DL
local b = game.Workspace.DoorEntrance.DR

function OpenDoor(Slide)
		a.Vector3.Size = 
		b.Vector3.Size = 
	script.Parent.Touched:connect(onTouch)
end
--unfinished.

A few things here buddy! c;

1. It's a.Size and b.Size. Also, you're not even changing the sizes of the doors.
2. You have to put the event AFTER the function, not inside it.
3. You don't need the parameter of "Slide" in the function since you're not even referring to it.
4. You're not even connecting any functions to the Touched event, there is no "OnTouch" function

local a = game.Workspace.DoorEntrance.DL
local b = game.Workspace.DoorEntrance.DR
local parent = script.Parent --You don't have to add a variable for script.Parent, just how I script is all

function OpenDoor()
        a.Size = Vector3.new(0,0,0) --Change this 0,0,0 to whatever you want
        b.Size = Vector3.new(0,0,0) --Change this 0,0,0 to whatever you want
end

parent.Touched:connect(OpenDoor)

If this works out for you, don't forget to upvote this answer, we both get rep! :D