Finding closest player inside sphere

[Salmonman]

I need to find the closest player to a vector position that is within 400 units of that position. I looked and found ents.FindByClass() and ents.FindInSphere() but I dont know how to sort the lists.

[Overv]

[lua]local pos = Vector( 0, 0, 0 )
local closestdistance, closestplayer, dist

for _, ply in ipairs( player.GetAll() ) do
dist = ply:GetPos():Distance( pos )

if ( !closestdistance or dist < closestdistance ) then
closestdistance = dist
closestplayer = ply
end
end[/lua]