setblock -23 56 110 iron_trapdoor[facing=north,half=bottom,open=true] 
playsound minecraft:block.iron_trapdoor.open master @a[tag=!heardSound30] -23 56 110
tag @a add heardSound30
kill @e[type=command_block_minecart,tag=level30]
summon command_block_minecart 0 1 -2 {Tags:["delay","level30"],PortalCooldown:5,Command:"function parkour_pyramid:levels/level30/close"}
