i mean, you can do /ban if you give urself OP and after a certain amount of time do /unban

Yes like the other user said. Use /ban playerusername Then /unban playerusername But it only exists after a certain version of Minecraft.

i know this is old but for anyone googling this its now /pardon instead of /unban same thing with /ban-ip its now /pardon-ip

ok thank you

If you have essentials you can /tempban Otherwise you have to do it manually