Where to put scripts that run when computer is resumed?

Question

I need to lock the screen when my computer is waken up from memory suspend,

So I tried to put the following script to /usr/lib/pm-utils/sleep.d and /etc/pm/sleep.d, but it never got executed,

#!/bin/sh

case "$1" in
    hibernate|suspend)
        ;;
    thaw|resume)
        vlock -ans
        ;;
    *) exit $NA
        ;;
esac

P.S It's pm-suspend not pm-hibernate.

EDIT

Tried systemd service as well, no luck:

# /etc/systemd/system/resume@.service
[Unit]
Description=User resume actions
After=suspend.target

[Service]
User=root
Type=simple
ExecStart=vlock -ans

[Install]
WantedBy=suspend.target

And I called systemctl enable resume@.service too, vlock wasn't called still.