diff --git a/src/interaction/objects.rs b/src/interaction/objects.rs
index 10d78c0..0ded7d8 100644
--- a/src/interaction/objects.rs
+++ b/src/interaction/objects.rs
@@ -8,6 +8,12 @@ use crate::{
 
 use super::{Interact, ui::InteractionOpportunity};
 
+#[derive(Component, PartialEq, Eq, PartialOrd, Ord, Clone, Copy)]
+struct KeyCardId(u64);
+
+#[derive(Component, PartialEq, Eq, PartialOrd, Ord, Clone, Copy)]
+struct OpenedByKey(KeyCardId);
+
 pub fn plugin(_app: &mut App) {}
 
 pub fn handle_pick_up(