How to make a one way barrier?

How do I make one way barriers? Every single tutorial I try either doesn’t work, or is too complicated.

You can use a zone. Make the barrier inactive on game start. When you enter the zone, brodcast it on a channel and activate the barrier.

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Here are some pictures:

You could change the active scope if you wanted to, or make the barrier invisible by setting the “Alpha” in “Appearance” to 0.
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Just make a barrier that has a zone on one side, wire the zone to the barrier: Player enters zone > deactivate barrier, wire the zone to a wire repeater (With a delay of 5.0 this makes it so the player has time to get through): Player leaves zone > wire pulse, wire the wire repeater to the barrier: Wire pulse > Activate barrier.