diff --git a/wagtail/admin/action_menu.py b/wagtail/admin/action_menu.py
index 0dfae25bf..24c6da652 100644
--- a/wagtail/admin/action_menu.py
+++ b/wagtail/admin/action_menu.py
@@ -57,7 +57,7 @@ class ActionMenuItem(metaclass=MediaDefiningClass):
 
 
 class PublishMenuItem(ActionMenuItem):
-    label = "Publish"
+    label = _("Publish")
     name = 'action-publish'
     template = 'wagtailadmin/pages/action_menu/publish.html'
 
@@ -133,6 +133,20 @@ class SaveDraftMenuItem(ActionMenuItem):
         return context
 
 
+class PageLockedMenuItem(ActionMenuItem):
+    name = 'action-page-locked'
+    label = _("Page locked")
+    template = 'wagtailadmin/pages/action_menu/page_locked.html'
+
+    def is_shown(self, request, context):
+        return ('page' in context) and (context['page'].locked)
+
+    def get_context(self, request, parent_context):
+        context = super().get_context(request, parent_context)
+        context['is_revision'] = (context['view'] == 'revisions_revert')
+        return context
+
+
 BASE_PAGE_ACTION_MENU_ITEMS = None
 
 
@@ -150,6 +164,7 @@ def _get_base_page_action_menu_items():
             PublishMenuItem(order=30),
             SubmitForModerationMenuItem(order=40),
             SaveDraftMenuItem(order=50),
+            PageLockedMenuItem(order=10000),
         ]
         for hook in hooks.get_hooks('register_page_action_menu_item'):
             BASE_PAGE_ACTION_MENU_ITEMS.append(hook())
@@ -176,7 +191,10 @@ class PageActionMenu:
         for hook in hooks.get_hooks('construct_page_action_menu'):
             hook(self.menu_items, self.request, self.context)
 
-        self.default_item = self.menu_items.pop() if self.menu_items else SaveDraftMenuItem(order=50)
+        try:
+            self.default_item = self.menu_items.pop()
+        except IndexError:
+            self.default_item = None
 
     def render_html(self):
         return render_to_string(self.template, {
diff --git a/wagtail/admin/templates/wagtailadmin/pages/action_menu/menu.html b/wagtail/admin/templates/wagtailadmin/pages/action_menu/menu.html
index 9347c22f2..e0a78add0 100644
--- a/wagtail/admin/templates/wagtailadmin/pages/action_menu/menu.html
+++ b/wagtail/admin/templates/wagtailadmin/pages/action_menu/menu.html
@@ -1,5 +1,7 @@
-{% if show_menu %}
+{% if default_menu_item %}
     {{ default_menu_item }}
+{% endif %}
+{% if show_menu %}
     <div class="dropdown-toggle icon icon-arrow-up"></div>
     <ul>
         {% for item in rendered_menu_items %}
diff --git a/wagtail/admin/templates/wagtailadmin/pages/action_menu/page_locked.html b/wagtail/admin/templates/wagtailadmin/pages/action_menu/page_locked.html
new file mode 100644
index 000000000..96a13f599
--- /dev/null
+++ b/wagtail/admin/templates/wagtailadmin/pages/action_menu/page_locked.html
@@ -0,0 +1,2 @@
+{% load i18n %}
+<button type="submit" class="button action-save {% if is_revision %}warning{% endif %}" disabled>{% trans 'Page locked' %}</button>
diff --git a/wagtail/admin/templates/wagtailadmin/pages/action_menu/save_draft.html b/wagtail/admin/templates/wagtailadmin/pages/action_menu/save_draft.html
index 58ef22e00..be8124fe2 100644
--- a/wagtail/admin/templates/wagtailadmin/pages/action_menu/save_draft.html
+++ b/wagtail/admin/templates/wagtailadmin/pages/action_menu/save_draft.html
@@ -1,2 +1,2 @@
 {% load i18n %}
-<button type="submit" class="button action-save button-longrunning {% if is_revision %}warning{% endif %}" data-clicked-text="{% trans 'Saving…' %}" {% if page.locked %}disabled {% endif %}><span class="icon icon-spinner"></span><em>{% if page.locked %}{% trans 'Page locked' %}{% else %}{% if is_revision %}{% trans 'Replace current draft' %}{% else %}{% trans 'Save draft' %}{% endif %}{% endif %}</em></button>
+<button type="submit" class="button action-save button-longrunning {% if is_revision %}warning{% endif %}" data-clicked-text="{% trans 'Saving…' %}"><span class="icon icon-spinner"></span><em>{% if is_revision %}{% trans 'Replace current draft' %}{% else %}{% trans 'Save draft' %}{% endif %}</em></button>