this idiot forgot to commit an entire month's worth of code

Assets/Scripts/ShopKeeperInteractionRadius.cs

@@ -0,0 +1,27 @@
+using System;
+using UnityEngine;
+
+public class ShopKeeperInteractionRadius : MonoBehaviour
+{
+    private bool playerNearby;
+    [SerializeField] private GameObject interactionIcon;
+    private void OnTriggerEnter2D(Collider2D other)
+    {
+        playerNearby = true;
+        interactionIcon.SetActive(true);
+    }
+
+    private void OnTriggerExit2D(Collider2D other)
+    {
+        playerNearby = false;
+        interactionIcon.SetActive(false);
+    }
+
+    private void Update()
+    {
+        if (playerNearby && Input.GetKeyDown(KeyCode.E))
+        {
+            ShopManager.instance.OpenShopUI();
+        }
+    }
+}