Just cannot get this automation trigger right

Hmmm, I found this:

for: 
  hours: 0
  minutes: "{{ states('input_select.snooze') | int }}"
  seconds: 0

If this doesn’t work, go back to how you had it and mark toms answer as the solution! (probably just mark his as the solution either way)

for: "00:{{ states('input_select.snooze') }}:00"