fix

app/storage/mongo/collections/tasks.go

@@ -71,7 +71,7 @@ func Take(queue string) (*Task, error) {
 				"taken_at": now,
 				"attempts": task.Attempts + 1,
 				"available_from": now.Add(
-					time.Duration(task.SecondsToExecute) * time.Second,
+					time.Duration(task.SecondsToExecute+task.Attempts) * time.Second,
 				),
 			},
 		},
@@ -91,7 +91,7 @@ func findTask(queue string, now time.Time) (*Task, error) {
 			"queue":          queue,
 			"available_from": bson.M{"$lte": now},
 		},
-		options.Find().SetLimit(1),
+		options.Find().SetSort(bson.D{{Key: "available_from", Value: 1}}).SetLimit(1),
 	)
 	if err != nil {
 		println("Error find")