Lock app minor fixes (#21764)

* Update comment in lock app

* remove unused mEndpointId

* add RequirePinForRemoteOperation logic to door lock linux example

* Restyled by clang-format

Co-authored-by: Restyled.io <commits@restyled.io>
diff --git a/examples/lock-app/efr32/include/LockManager.h b/examples/lock-app/efr32/include/LockManager.h
index 01332f9..0e6a3d5 100644
--- a/examples/lock-app/efr32/include/LockManager.h
+++ b/examples/lock-app/efr32/include/LockManager.h
@@ -171,7 +171,6 @@
 
 private:
     friend LockManager & LockMgr();
-    chip::EndpointId mEndpointId;
     State_t mState;
 
     Callback_fn_initiated mActionInitiated_CB;
diff --git a/examples/lock-app/efr32/src/LockManager.cpp b/examples/lock-app/efr32/src/LockManager.cpp
index 7e52e95..63ce72e 100644
--- a/examples/lock-app/efr32/src/LockManager.cpp
+++ b/examples/lock-app/efr32/src/LockManager.cpp
@@ -643,7 +643,7 @@
     // If a pin code is not given
     if (!pin.HasValue())
     {
-        ChipLogDetail(Zcl, "Door Lock App: PIN code is not specified, but it is required [endpointId=%d]", mEndpointId);
+        ChipLogDetail(Zcl, "Door Lock App: PIN code is not specified [endpointId=%d]", endpointId);
 
         // If a pin code is not required
         if (!requirePin)
@@ -656,6 +656,8 @@
             return true;
         }
 
+        ChipLogError(Zcl, "Door Lock App: PIN code is not specified, but it is required [endpointId=%d]", endpointId);
+
         return false;
     }
 
@@ -672,7 +674,7 @@
         {
             ChipLogDetail(Zcl,
                           "Lock App: specified PIN code was found in the database, setting lock state to \"%s\" [endpointId=%d]",
-                          lockStateToString(lockState), mEndpointId);
+                          lockStateToString(lockState), endpointId);
 
             DoorLockServer::Instance().SetLockState(endpointId, lockState);
 
@@ -683,7 +685,7 @@
     ChipLogDetail(Zcl,
                   "Door Lock App: specified PIN code was not found in the database, ignoring command to set lock state to \"%s\" "
                   "[endpointId=%d]",
-                  lockStateToString(lockState), mEndpointId);
+                  lockStateToString(lockState), endpointId);
 
     err = DlOperationError::kInvalidCredential;
     return false;
diff --git a/examples/lock-app/linux/src/LockEndpoint.cpp b/examples/lock-app/linux/src/LockEndpoint.cpp
index 7c8518c..c3d52c6 100644
--- a/examples/lock-app/linux/src/LockEndpoint.cpp
+++ b/examples/lock-app/linux/src/LockEndpoint.cpp
@@ -16,6 +16,7 @@
  *    limitations under the License.
  */
 #include "LockEndpoint.h"
+#include <app-common/zap-generated/attributes/Accessors.h>
 #include <cstring>
 
 using chip::to_underlying;
@@ -362,15 +363,29 @@
 
 bool LockEndpoint::setLockState(DlLockState lockState, const Optional<chip::ByteSpan> & pin, DlOperationError & err)
 {
+    // Assume pin is required until told otherwise
+    bool requirePin = true;
+    chip::app::Clusters::DoorLock::Attributes::RequirePINforRemoteOperation::Get(mEndpointId, &requirePin);
+
+    // If a pin code is not given
     if (!pin.HasValue())
     {
-        ChipLogDetail(Zcl, "Lock App: PIN code is not specified, setting door lock state to \"%s\" [endpointId=%d]",
-                      lockStateToString(lockState), mEndpointId);
+        ChipLogDetail(Zcl, "Door Lock App: PIN code is not specified [endpointId=%d]", mEndpointId);
 
-        mLockState = lockState;
-        DoorLockServer::Instance().SetLockState(mEndpointId, mLockState);
+        // If a pin code is not required
+        if (!requirePin)
+        {
+            ChipLogDetail(Zcl, "Door Lock App: setting door lock state to \"%s\" [endpointId=%d]", lockStateToString(lockState),
+                          mEndpointId);
 
-        return true;
+            DoorLockServer::Instance().SetLockState(mEndpointId, lockState);
+
+            return true;
+        }
+
+        ChipLogError(Zcl, "Door Lock App: PIN code is not specified, but it is required [endpointId=%d]", mEndpointId);
+
+        return false;
     }
 
     // Find the credential so we can make sure it is not absent right away