Added global ticker to locker.go

Signed-off-by: Effi-S <effi.szt@gmail.com>

Author: Effi-S

token/services/selector/simple/inmemory/locker.go

@@ -381,6 +381,9 @@ func (d *locker) lockedCount() int {
 
 func (d *locker) scan(ctx context.Context) {
 	defer close(d.scanDone)
+
+	ticker := time.NewTicker(d.sleepTimeout)
+	defer ticker.Stop()
 	for {
 		// Check for shutdown before starting a new scan cycle.
 		select {
@@ -462,7 +465,7 @@ func (d *locker) scan(ctx context.Context) {
 		for {
 			logger.DebugfContext(ctx, "token collector: sleep for some time...")
 			select {
-			case <-time.After(d.sleepTimeout):
+			case <-ticker.C:
 			case <-ctx.Done():
 				logger.Debugf("token collector: stopping during sleep")