diff --git a/aw_watcher_afk/afk.py b/aw_watcher_afk/afk.py
index e188fd7..04a860e 100755
--- a/aw_watcher_afk/afk.py
+++ b/aw_watcher_afk/afk.py
@@ -13,13 +13,13 @@
 
 if system == "Windows":
     # noreorder
-    from .windows import seconds_since_last_input  # fmt: skip
+    from .windows import seconds_since_last_input, lock_screen_shown  # fmt: skip
 elif system == "Darwin":
     # noreorder
-    from .macos import seconds_since_last_input  # fmt: skip
+    from .macos import seconds_since_last_input, lock_screen_shown  # fmt: skip
 elif system == "Linux":
     # noreorder
-    from .unix import seconds_since_last_input  # fmt: skip
+    from .unix import seconds_since_last_input, lock_screen_shown  # fmt: skip
 else:
     raise Exception(f"Unsupported platform: {system}")
 
@@ -84,8 +84,10 @@ def heartbeat_loop(self):
 
                 now = datetime.now(timezone.utc)
                 seconds_since_input = seconds_since_last_input()
+                showing_lock_screen = lock_screen_shown()
                 last_input = now - timedelta(seconds=seconds_since_input)
                 logger.debug(f"Seconds since last input: {seconds_since_input}")
+                logger.debug(f"Lock screen shown: {showing_lock_screen}")
 
                 # If no longer AFK
                 if afk and seconds_since_input < self.settings.timeout:
@@ -95,7 +97,7 @@ def heartbeat_loop(self):
                     # ping with timestamp+1ms with the next event (to ensure the latest event gets retrieved by get_event)
                     self.ping(afk, timestamp=last_input + td1ms)
                 # If becomes AFK
-                elif not afk and seconds_since_input >= self.settings.timeout:
+                elif not afk and (seconds_since_input >= self.settings.timeout or (showing_lock_screen and seconds_since_input >= 5)):
                     logger.info("Became AFK")
                     self.ping(afk, timestamp=last_input)
                     afk = True
diff --git a/aw_watcher_afk/macos.py b/aw_watcher_afk/macos.py
index 5fd2717..5bf8bdd 100755
--- a/aw_watcher_afk/macos.py
+++ b/aw_watcher_afk/macos.py
@@ -1,6 +1,14 @@
 from Quartz.CoreGraphics import (CGEventSourceSecondsSinceLastEventType,
                                  kCGEventSourceStateHIDSystemState,
-                                 kCGAnyInputEventType)
+                                 kCGAnyInputEventType,
+                                 CGSessionCopyCurrentDictionary)
+
+
+def lock_screen_shown() -> bool:
+    session = CGSessionCopyCurrentDictionary()
+    if "CGSSessionScreenIsLocked" in session:
+        return session["CGSSessionScreenIsLocked"] == True
+    return False
 
 
 def seconds_since_last_input() -> float:
@@ -11,4 +19,4 @@ def seconds_since_last_input() -> float:
     from time import sleep
     while True:
         sleep(1)
-        print(seconds_since_last_input())
+        print(seconds_since_last_input(), lock_screen_shown())
diff --git a/aw_watcher_afk/unix.py b/aw_watcher_afk/unix.py
index 42a7b9f..582d739 100755
--- a/aw_watcher_afk/unix.py
+++ b/aw_watcher_afk/unix.py
@@ -43,7 +43,12 @@ def seconds_since_last_input():
     return _last_input_unix.seconds_since_last_input()
 
 
+def lock_screen_shown() -> bool:
+    # TODO: Linux implementation
+    return False
+
+
 if __name__ == "__main__":
     while True:
         sleep(1)
-        print(seconds_since_last_input())
+        print(seconds_since_last_input(), lock_screen_shown())
diff --git a/aw_watcher_afk/windows.py b/aw_watcher_afk/windows.py
index a55f7cb..106958a 100644
--- a/aw_watcher_afk/windows.py
+++ b/aw_watcher_afk/windows.py
@@ -26,6 +26,11 @@ def _getTickCount() -> int:
     return c_GetTickCount()
 
 
+def lock_screen_shown() -> bool:
+    # TODO: Windows implementation
+    return False
+
+
 def seconds_since_last_input():
     seconds_since_input = (_getTickCount() - _getLastInputTick()) / 1000
     return seconds_since_input
@@ -34,4 +39,4 @@ def seconds_since_last_input():
 if __name__ == "__main__":
     while True:
         time.sleep(1)
-        print(seconds_since_last_input())
+        print(seconds_since_last_input(), lock_screen_shown())