Grant Permission to Folders in SharePoint Document Library using PowerShell

Requirement: grant folder permission in SharePoint using PowerShell script.

Here is my script to grant access to a folder in SharePoint Library using PowerShell:
Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

function Set-FolderPermissions($webUrl, $FolderURL, $UserAccount, $PermissionLevel)
    #Get Web
    $web = Get-SPWeb $webUrl   
    #Get the User   
    $user = $web.EnsureUser($UserAccount)
    #Get the Permission Level
    $RoleDefinition = $web.RoleDefinitions[$PermissionLevel]
    #Get the Folder    
    $Folder = $web.GetFolder($FolderURL).Item
    if ($Folder -ne $null) 
        #Check if Item has Unique Permissions. If not, Break the inheritance
        if($folder.HasUniqueRoleAssignments -eq $false) 

        #Grant Permissions
        $RoleAssignment = New-Object Microsoft.SharePoint.SPRoleAssignment($user)

        Write-Host "Successfully added $($user) to folder $($Folder.Name)" -foregroundcolor Green



#Call the function to Grant permission to a folder
Set-FolderPermissions $WebURL $FolderURL $UserAccount $PermissionLevel

Set Permission to SharePoint Group to All Folders in a Library:
Certain folders in a SharePoint library is with unique permission. Requirement is to add permission to a SharePoint group to all folders with unique permissions.
Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

### Variables ###
#Site URL and List names
$SiteURL = ""
$ListName = "Documents"                 

#Get site and List objects
$web = Get-SPWeb $SiteURL
$List = $web.Lists.TryGetList($ListName)
$GroupName = "Support Visitors"
$PermissionLevel = "Read"

    if ($list -ne $null) 
       $Foldercoll=$List.Folders | Sort-Object Name

        #Loop through each Item in the List
         foreach($folder in $Foldercoll)
                #Check if Item has Unique Permissions.
                if($folder.HasUniqueRoleAssignments -eq $true) 
                    #Grant Access
                    if ($web.SiteGroups[$GroupName] -ne $null) 
                        #Get the Group from GroupName Parameter 
                        $group = $web.SiteGroups[$GroupName] 
                        $roleAssignment = new-object Microsoft.SharePoint.SPRoleAssignment($group) 

                        #Get Permission Level, such as "Read", "Contribute", etc
                        $roleDefinition = $web.RoleDefinitions[$PermissionLevel]
                        #Grant Access to specified Group
                        #To Remove Access: Call  $item.RoleAssignments.Remove($group) . No Need for objects: roleAssignment, roleDefinition
                        Write-Host "Successfully added $($PermissionLevel) to $GroupName group in $($Folder.Name)" -foregroundcolor Green 

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