diff --git a/app/Models/Study.php b/app/Models/Study.php
index 1679b06..a1e567b 100644
--- a/app/Models/Study.php
+++ b/app/Models/Study.php
@@ -288,6 +288,30 @@ public function registerMediaConversions(?Media $media = null): void
             ->nonQueued();
     }
 
+    public function isLocked(): bool
+    {
+        return $this->locked_at !== null;
+    }
+
+    public function lockStudy(?User $user = null): void
+    {
+        $this->update(
+            [
+                'locking_physician_id' => $user?->id ?? auth()->id(),
+                'locked_at' => now(),
+            ]
+        );
+    }
+
+    public function unlockStudy(): void
+    {
+        $this->update(
+            [
+                'locked_at' => null,
+            ]
+        );
+    }
+
     public function registerMediaCollections(): void
     {
         $this->addMediaCollection(self::MEDIA_COLLECTION)
@@ -318,7 +342,6 @@ public function getGenderNameAttribute(): string
     protected function casts(): array
     {
         return [
-            'is_locked' => 'boolean',
             'is_archived' => 'boolean',
             'study_status' => StudyLevelStatus::class,
             'report_status' => ReportStatus::class,