systemctl --user status xidlehook

journalctl.log

● xidlehook.service - Screen Lock Daemon
   Loaded: loaded (/nix/store/531wyrgxz9wcmw3vivc60g1xwx9r0wnb-unit-xidlehook.service/xidlehook.service; enabled; vendor preset: enabled)
   Active: active (running) since Sun 2019-09-29 15:55:53 EEST; 16s ago
 Main PID: 20689 (ccypk602qzd1a81)
   CGroup: /user.slice/user-1000.slice/user@1000.service/xidlehook.service
           ├─20689 /nix/store/l6h4ya0wzb4b8mr0y58k2gh2nhfql4sn-bash-4.4-p23/bin/bash -e /nix/store/ccypk602qzd1a81fd4485rqr8wn9sys7-unit-script-xidlehook-start
           └─20690 /nix/store/wqsnqp514wyh7wig7k6scw0255w8wmhm-xidlehook-0.7.0/bin/xidlehook --not-when-fullscreen --not-when-audio --timer normal 5 /nix/store/lyf5hlrgy1s2crgy9yv52hp2qdvz0ihr-xsecurelock-1.4.0/libexec/xsecurelock/dimmer   --timer primary 15 /run/wrappers/bin/sudo /nix/store/4vw3gb6dk116y38vwgjv3ymq5mfdcfli-systemd-243/bin/systemctl start physlock

The script:

#! /nix/store/l6h4ya0wzb4b8mr0y58k2gh2nhfql4sn-bash-4.4-p23/bin/bash -e
#!/bin/sh
/nix/store/wqsnqp514wyh7wig7k6scw0255w8wmhm-xidlehook-0.7.0/bin/xidlehook \
  --not-when-fullscreen \
  --not-when-audio \
  --timer normal 5 '/nix/store/lyf5hlrgy1s2crgy9yv52hp2qdvz0ihr-xsecurelock-1.4.0/libexec/xsecurelock/dimmer' ' ' \
  --timer primary 15 '/run/wrappers/bin/sudo /nix/store/4vw3gb6dk116y38vwgjv3ymq5mfdcfli-systemd-243/bin/systemctl start physlock' ' '