Lock Workstation before Suspending on Linux Mint 18.04

50-enable-suspend-on-lockscreen.pkla

#  /var/lib/polkit-1/localauthority/50-local.d/50-enable-suspend-on-lockscreen.pkla
[Allow suspending in lockscreen]
Identity=unix-group:users
Action=org.freedesktop.login1.suspend
ResultAny=yes
ResultInactive=yes
ResultActive=yes

[Allow setting wall message in lockscreen]
Identity=unix-group:users
Action=org.freedesktop.login1.set-wall-message
ResultAny=yes
ResultInactive=yes
ResultActive=yes

LockStation.sh

#!/bin/bash
# 
# After being pissed at systemd not locking the fucking screen prior
# to suspending and not having any clear method (aside from xss, which I didn't like)
# I decided to find another solution so I can have my monitor locked when resumed
# with an added bonus this delays the inevitable by 5 minutes. 
#
# @todo: extend the script bat power / plugged in and choosing different scenarios depending.
# 
# In order for this to work a few items need done. One the file at /etc/UPower/UPower.conf needs IgnoreLid=true
#    the reason is we are taking control of the lid action, so this will prevent systemd capturing it and
#    doing it;s own desired fuckery we don't want. 
#
# next, set ctrl+alt+l  (or your prefered shortcut) to this script, I placed it in /usr/bin:
#     /usr/bin/LockStation.sh lock
#
# Next we need to add our user to the users group:
# sudo usermod -aG user "YOURUSERHERE"
# 
# Next is we need to modify the polkit, for my polkit version (>1.6 i believe) I needed to create a file and 
# add this to that file located at (note need root to create): 
#  /var/lib/polkit-1/localauthority/50-local.d/50-enable-suspend-on-lockscreen.pkla
#
# This effectively allows us to suspend and send wall message as a non-admin user in the users group
#   which our user is from the sudo command above (see extra file with the name)
#
# And now restart our system and our script should work
#Sets the path where the script lives (remember to chmod +x)
SCRIPTPATH="/usr/local/bin/LockStation.sh"

# Check if we are locking the system ( Ctrl+Alt+L )
if [ "$@" == "lock" ]
then
  CMDLOCK="$SCRIPTPATH SLICKCHK"

  # After 5 minutes check is slick greeter is on if not kill it, if slick-greeter is active BAIL
  # After 6 minutes, if the locker did not kick in, just kill it
  xautolock -time 5 -locker "$CMDLOCK"  -killtime 6 -killer "$SCRIPTPATH KILL" &

  # Lock
  light-locker-command --lock

elif [ "$@" == "SLICKCHK" ]
then
  # this is called by the xautolock
  # Search for slick-greeter as my system uses that for the lock screen
  # @todo  fix for your greater, adding the [ ] around the initial letter
  # removes it's own result from grep, ensuring there can be none on the results
  SLICK=`ps aux | grep [s]lick-greeter`
  
  # If slick-greeter is empty, the autolock has been X minutes, find it and kill it
  if [ -n $SLICK ]
  then
    #Kills the xautolock and exits, we are finished here.
    ALOCK=`pgrep [x]autolock`
    kill -9 $ALOCK
    exit 0
  fi
  
  # If the slick greeter was found and it has been 5 minutes, lets just hibernate.
  # @todo added battery check, only suspend on battery?
  if on_ac_power;
  then
     exit 0
     # No action taken due to AC power, add custom item here? Maybe after like 10 checks (50 minutes) sleep on AC power?
     # I prefer blank due to I maybe running a process, so prefer to let it do it
  else
     systemctl suspend
  fi
elif [ "$@" == "KILL" ]
then
  ALOCK=`pgrep [x]autolock`
  kill -9 $ALOCK
fi