diff -up kbd-2.4.0/src/vlock/auth.c.orig kbd-2.4.0/src/vlock/auth.c
--- kbd-2.4.0/src/vlock/auth.c.orig	2018-06-08 12:20:10.000000000 +0200
+++ kbd-2.4.0/src/vlock/auth.c	2024-09-09 11:28:02.001003452 +0200
@@ -91,6 +91,12 @@ int get_password(pam_handle_t *pamh, con
 		}
 		fflush(stdout);
 
+		if (prompt) {
+			printf(_("Press ENTER to continue.\n"));
+			fflush(stdout);
+			(void )getchar();
+		}
+
 		/*
 		 * No need to request a delay on failure via pam_fail_delay(3):
 		 * authentication module should do it for us.
diff -up kbd-2.4.0/src/vlock/parse.c.orig kbd-2.4.0/src/vlock/parse.c
--- kbd-2.4.0/src/vlock/parse.c.orig	2019-06-25 11:41:55.000000000 +0200
+++ kbd-2.4.0/src/vlock/parse.c	2024-09-09 11:28:02.001003452 +0200
@@ -39,6 +39,13 @@
  */
 int o_lock_all;
 
+/*
+ * This determines whether there will be prompt before invoking pam
+ * auth stack.
+ * 0 means no, 1 means yes.
+ */
+int prompt;
+
 const char *
 locked_name(void)
 {
@@ -65,6 +72,8 @@ show_help(void)
 	         "       switch to other virtual consoles.\n"
 	         "-a or --all: lock all virtual consoles by preventing other users\n"
 	         "       from switching virtual consoles.\n"
+                 "-p or --prompt: wait for keypress before invoking pam auth stack,\n"
+                 "       useful for unlocking with smartcard setup.\n"
 	         "-v or --version: Print the version number of vlock and exit.\n"
 	         "-h or --help: Print this help message and exit.\n"),
 	       progname, progname);
@@ -76,13 +85,14 @@ void parse(int ac, char *const av[])
 	static struct option long_options[] = {
 		{ "current", 0, 0, 'c' },
 		{ "all", 0, 0, 'a' },
+		{ "prompt", 0, 0, 'p' },
 		{ "version", 0, 0, 'v' },
 		{ "help", 0, 0, 'h' },
 		{ 0, 0, 0, 0 },
 	};
 	int c;
 
-	while ((c = getopt_long(ac, av, "acvh", long_options, 0)) != -1) {
+	while ((c = getopt_long(ac, av, "acpvh", long_options, 0)) != -1) {
 		switch (c) {
 			case 'c':
 				o_lock_all = 0;
@@ -90,6 +100,9 @@ void parse(int ac, char *const av[])
 			case 'a':
 				o_lock_all = 1;
 				break;
+			case 'p':
+				prompt = 1;
+				break;
 			case 'v':
 				fprintf(stderr, "%s\n", VERSION);
 				exit(EXIT_SUCCESS);
diff -up kbd-2.4.0/src/vlock/vlock.h.orig kbd-2.4.0/src/vlock/vlock.h
--- kbd-2.4.0/src/vlock/vlock.h.orig	2017-01-12 22:23:16.000000000 +0100
+++ kbd-2.4.0/src/vlock/vlock.h	2024-09-09 11:28:02.001003452 +0200
@@ -40,5 +40,12 @@ const char *locked_name(void);
  */
 extern int o_lock_all;
 
+/*
+ * This determines whether there will be prompt before invoking pam
+ * auth stack.
+ * 0 means no, 1 means yes.
+ */
+extern int prompt;
+
 /* Copy of the VT mode when the program was started. */
 extern int is_vt;