KeyboardPlugin.resetKeys is a new method that will reset the state of any Key object created by a Scene's Keyboard Plugin.

Author: photonstorm

src/input/keyboard/KeyboardPlugin.js

@@ -584,18 +584,52 @@ var KeyboardPlugin = new Class({
     },
 
     /**
-     * Shuts the Keyboard Plugin down.
-     * All this does is remove any listeners bound to it.
+     * Resets all Key objects created by _this_ Keyboard Plugin back to their default un-pressed states.
+     * This can only reset keys created via the `addKey`, `addKeys` or `createCursors` methods.
+     * If you have created a Key object directly you'll need to reset it yourself.
+     * 
+     * This method is called automatically when the Keyboard Plugin shuts down, but can be
+     * invoked directly at any time you require.
+     *
+     * @method Phaser.Input.Keyboard.KeyboardPlugin#resetKeys
+     * @since 3.15.0
+     */
+    resetKeys: function ()
+    {
+        var keys = this.keys;
+
+        for (var i = 0; i < keys.length; i++)
+        {
+            //  Because it's a sparsely populated array
+            if (keys[i])
+            {
+                keys[i].reset();
+            }
+        }
+
+        return this;
+    },
+
+    /**
+     * Shuts this Keyboard Plugin down. This performs the following tasks:
+     * 
+     * 1 - Resets all keys created by this Keyboard plugin.
+     * 2 - Stops and removes the keyboard event listeners.
+     * 3 - Clears out any pending requests in the queue, without processing them.
      *
      * @method Phaser.Input.Keyboard.KeyboardPlugin#shutdown
      * @private
      * @since 3.10.0
      */
     shutdown: function ()
     {
+        this.resetKeys();
+
         this.stopListeners();
 
         this.removeAllListeners();
+
+        this.queue = [];
     },
 
     /**