[Evocator]

You need to toggle spectating mode when they connect (so they won't go to class selection) and set a timer for as long as you would like them to wait. Once the timer hits, turn off their spectating mode and they should return to class selection...

https://sampwiki.blast.hk/wiki/TogglePlayerSpectating
https://sampwiki.blast.hk/wiki/SetTimerEx